Document:

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                                                                    EXHIBIT 10.5

                             SUB-SUBLEASE AGREEMENT

  This Sub-sublease Agreement ("Sub-sublease") is made effective as of the ___
day of July, 2000, (the "Effective Date") by and between GW Com, Inc., a
Delaware corporation ("Sub-sublessor"), and Align Technology, Inc., a Delaware
corporation ("Sub-sublessee"). Sub-sublessor agrees to Sub-sublease to Sub-
sublessee, and Sub-sublessee agrees to Sub-sublease from Sub-sublessor, those
certain premises situated in the City of Santa Clara, County of Santa Clara,
State of California, consisting of approximately 15,704 rentable square feet of
space located in the building (the "Building") known as 851 Martin Avenue, Santa
Clara, California, more particularly set forth on Exhibit "A" hereto (the "Sub-
subleased Premises").

                                   ARTICLE 1

                  MASTER LEASE, SUBLEASE AND OTHER AGREEMENTS

     1.1  Subordinate to Master Lease. Except as specifically set forth herein,
          ---------------------------
this Sub-sublease is subject and subordinate to all of the terms and
conditions of the Sublease (the "Master Sublease") dated April 17, 2000,
between Golf Pro International, Inc., ("Master Sublessor") and Sub-sublessor
as "Sublessee" and the lease dated October 4, 1999 ("Master Lease") between
James S. Lindsey a "Lessor" ("Master Lessor"), and Master Sublessor, as the
"Lessee". Sub-sublessee hereby assumes and agrees to perform the obligations
of Sublessee under the Master Sublease and the Master Lease as more
particularly set forth herein, except as specifically stated to the contrary
herein. Unless otherwise defined, all capitalized terms used herein shall have
the same meanings as given them in the Master Sublease. A copy of the Master
Sublease is attached hereto as Exhibit "B1" and incorporated herein by this
reference. A copy of the Master Lease is attached hereto as Exhibit "B2" and
incorporated herein by this reference. Sub-sublessee shall not commit or
permit to be committed any act or omission which would violate any term or
condition of the Master Sublease or the Master Lease, as incorporated herein.
Sub-sublessee shall neither do nor permit anything to be done which would
cause the Master Sublease to be terminated or forfeited by reason of any right
of termination or forfeiture reserved or vested in Master Sublessor under the
Master Sublease, and Sub-sublessee shall indemnify and hold Sub-sublessor
harmless from and against all liability, judgments, costs, demands, claims,
and damages of any kind whatsoever (including, without limitation, attorneys'
fees and court costs) by reason of any failure on the part of Sub-sublessee to
perform any of the obligations of Sublessee under the Master Sublease which
Sub-sublessee has become obligated hereunder to perform. In the event of the
termination of Sub-sublessor's interest as Sublessee under the Master Sublease
for any reason, then this Sub-sublease shall terminate automatically upon such
termination without any liability of Master Lessor or Master Sublessor to Sub-
sublessee and other than for Sub-sublessor's breach, such termination shall be
without any liability of Sub-sublessor to Sub-sublessee. Sub-sublessee
represents and warrants to Sub-sublessor that it has read and is familiar with
the Master Sublease and the Master Lease. Notwithstanding any other provision
in this Sub-sublease, in the event the Master Sublease is canceled or
terminated for any reason, or involuntarily surrendered by operation of law
before the expiration date of this Sub-sublease, Sub-sublessee agrees, at the
sole option of the Master Sublessor, to attorn to the Master Sublessor for the
balance of the term of this Sub-sublease and on the then executory terms of
this Sub-sublease. That attornment will be evidenced by an
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agreement in form and substance reasonable satisfactory to the Master
Sublessor. Sub-sublessee agrees to execute and deliver such an agreement at
any time within ten (10) business days after request by the Master Sublessor.
Sub-sublessee waives the provisions of any law now or later in effect that may
provide Sub-sublessee any right to terminate this Sub-sublease or to surrender
possession of the Sub-subleased Premises in the event any proceeding is
brought by the Master Sublessor to terminate the Master Sublease. Sub-
sublessor will use reasonable efforts to cause Master Lessor and/or Master
Sublessor to fulfill their obligations under the Master Lease and Master
Sublease, respectively, as they pertain to the Sub-subleased Premises.

     1.2  Applicable Provisions. All of the terms and conditions contained in
          ---------------------
the Master Sublease as they may apply to the Sub-subleased Premises, except
those directly contradicted by the terms and conditions contained in this
document, and specifically except for Sections 1, 2, 3, 4, 5, 6.1, 6.2, 7, 9,
22, 23 and 25 of the Master Sublease are incorporated herein and shall be
terms and conditions of this Sub-sublease (with each reference therein to
"Sublessor" or "Sublessee", and "Sublease" to be deemed to refer to Sub-
sublessor, Sub-sublessee, and Sub-sublease, respectively, as appropriate).
With respect to the following provisions of the Master Lease that are
incorporated herein, the reference to Lessor shall mean Master Lessor only
8.2(b), 8.3(a), 8.3(b), 9.2, 9.3, 9.5, 10.1 and 57, and the following
additional sections of the Master Lease beyond those set forth or qualified in
Paragraph 10 of the Master Sublease are not incorporated herein 1, 2.1,
2.2,.2.3, 2.5, 2.6 as to the number of parking spaces, 3, 7.3(a), (b), 10,
11, 15.1, 37, 50, 56, 58, 59, and along with all of the following terms and
conditions set forth in this document, shall constitute the complete terms and
conditions of this Sub-sublease. Sub-sublessee's share of Common Area expenses
shall be 9.967% of expenses attributable to the entire Project, 15.446% of
expenses attributable to the Building, and 31.40% of the expenses attributable
to the common expenses of the Sublease Premises.

     1.3  Sub-sublessor shall have no liability to Sub-sublessee or any other
person for damage of any nature whatsoever as a result of the failure of Master
Sublessor or Master Lessor to perform said obligations except for Master
Sublessor's termination of the Sub-sublessor's interest as Sublessee under the
Master Sublease in the event of Sub-sublessor's breach of the Master Sublease,
and Sub-sublessee shall indemnify and hold Sub-sublessor harmless from any and
all claims and liability whatsoever for any such damage including, without
limitation, all costs and attorneys' fees incurred in defending against same.

                                  ARTICLE 2

                                    TERM

     2.1  Term.  The term of this Sub-sublease shall commence on the earlier of:
          ----
(i) the date Sub-sublessor completes the demising wall and associated
improvements as set forth on Exhibit C hereto; or (ii) the date Sub-sublessee
commences to operate its business on the Sub-subleased Premises. This shall be
referred to as the "Commencement Date." The term of this Sub-sublease shall end
on August 14, 2002, unless sooner terminated pursuant to any provision of the
Master Sublease or Master Lease applicable to the Sub-subleased Premises (the
"Expiration Date"). Sublessor shall have no obligation to Sub-sublessee to
exercise any of its options to extend under the Master Sublease or Master Lease.

                                       2
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     2.2  Option to Extend.  Sub-sublessee shall have no option to extend this
          ----------------
Sub-sublease.

     2.3  Sub-sublessor's Inability to Deliver Sub-subleased Premises. In the
          -----------------------------------------------------------
event Sub-sublessor is unable to deliver possession of the Sub-subleased
Premises on or before the Commencement Date, Sub-sublessor shall not be liable
for any damage caused thereby, nor shall his Sub-sublease be void or voidable,
but Sub-sublessee shall not be liable for Rent until such time as Sub-sublessor
offers to deliver possession of the Sub-subleased Premises to Sub-sublessee, but
the term hereof shall not be extended by such delay.  Notwithstanding the
foregoing, if the Sub-subleased Premises are not delivered to Sub-sublessee in a
broom-clean condition on or before August 15, 2000, Sub-sublessee, at its
election and without waiving any other rights it may have, may terminate this
Sub-sublease upon written notice to Sub-sublessor and Sub-sublessor shall return
any payments made by Sub-sublessee to Sub-sublessor within the (10) days after
such termination.

    2.4  Early Access.  Subject to Master Lessor's and Master Sublessor's
         ------------
approval, and after execution of the Sub-Sublease by both parties, Sub-sublessee
may be permitted early access to the Sub-subleased Premises ("Early Access")
prior to the Commencement Date for the purpose of Tenant Improvement
construction (defined below). Such Early Access shall be subject to all of the
provisions of this Sub-sublease, except that Sub-sublessee shall not be required
to pay Rent.

                                   ARTICLE 3

                                      RENT

     3.1  Rent.  Sub-sublessee shall pay to Sub-sublessor each month during the
          ----
term of this Sub-sublease, rent in the amount of:

                         Rental Period               Monthly Rent
                         -------------               ------------

          Commencement Date through July 14, 2001      $64,386
          July 15,2001 through July 14,2002            $66,899

     First month's rent shall be paid on execution hereof and monthly rent is
due and payable on or before the first of each month thereafter commencing on
the first day of the first calendar month immediately after the Commencement
Date.  Rent for partial months at the commencement or termination of this Sub-
sublease shall be prorated based on the number of days in such month. Rent shall
be paid to the Sub-sublessor at its business address noted herein, or at any
other place Sub-sublessor may from time to time designate by written notice
mailed or delivered to Sub-sublessee.

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    3.2   Additional Rent.
          ---------------

          (a) If Sub-sublessee shall procure any additional services from Master
Sublessor or Master Lessor, Sub-sublessee shall make such payment to Sub-
sublessor or Master Sublessor or Master Lessor, as Sub-sublessor shall direct.
Also, Sub-sublessee shall pay its pro rata share, as defined in Paragraph 1.2
above, of any increases in Common Area expenses or common expenses over and
above the base year of 2000 ("Base Year").

          (b) After Hours Charges.  Sub-sublessee shall pay to Sub-sublessor
              -------------------
within fifteen (15) days of receipt of notice from Sub-sublessor for any charges
for extraordinary electrical or HVAC use ("After Hours Use").  Such After Hours
Use shall be charged at a rate that is reasonably determined by Sub-sublessor.
For the purposes of this Section 3.2, normal business hours shall be deemed to
be 8 a.m. through 6 p.m., Monday through Friday, and 9 a.m. through 1 p.m. on
Saturday, excepting locally recognized holidays.  All other use shall be "After
Hours Use".

          (c) Any rent or other sums payable by Sub-sublessee under this Article
3 shall constitute and be due as additional rent. Base Rent and additional rent
shall herein be referred to as "Rent".

          (d) Notwithstanding Section 10 of the Master Sublease, all rent or
other sums payable to Sub-sublessor hereunder shall be paid to Sub-sublessor,
unless otherwise directed by Sub-sublessor.

                                  ARTICLE 4

                              SECURITY DEPOSIT

     4.1  Security Deposit.  Upon execution hereof, Sub-sublessee shall deposit
          ----------------
with Sub-sublessor the sum of one hundred eighty-eight thousand four hundred
forty-eight dollars and 00/100 ($188,448.00) as and for a Security Deposit to
secure Sub-sublessee's full and timely performance of all of its obligations
hereunder. If Sub-sublessee fails to pay Rent or any other sums as and when
due hereunder, or otherwise defaults with respect to any provision of this Sub-
sublease, Sub-sublessor may (but shall not be obligated to) use, apply, or
retain all or any portion of said deposit for payment of any sum for which Sub-
sublessee is obligated or which will compensate Sub-sublessor for any loss or
damage which Sub-sublessor may suffer thereby. Any such use, application, or
retention shall not constitute a waiver by Sub-sublessor of its right to
enforce its other remedies hereunder, at law, or in equity. If any portion of
said deposit is so used, applied, or retained, Sub-sublessee shall, within 10
days after delivery of written demand from Sub-sublessor, restore said deposit
to its original amount. Sub-sublessee's failure to do so shall constitute a
material breach of this Sub-sublease, and in such event Sub-sublessor may
elect, among or in addition to other remedies, to terminate this Sub-sublease.
Sub-sublessor shall not be a trustee of such deposit, and shall not be
required to keep this deposit separate from its accounts. Sub-sublessor alone
shall be entitled to any interest or earnings thereon and Sub-sublessor shall
have the free use of same. If Sub-sublessee fully and faithfully performs all
of its obligations hereunder, then so much of the deposit as remains shall be
returned to Sub-sublessee (without payment of interest or earnings thereon)
within 30 days after the later of (i) expiration

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or sooner termination of the term hereof, or (ii) Sub-sublessee's surrender of
possession of the Sub-subleased Premises to Sub-sublessor.

     4.2  Letter of Credit.  Within three (3) days of receipt of a facsimile
          ----------------
copy of an executed Master Lessor and Master Sublessor consent to this Sub-
sublease, Sub-sublessee shall provide to Sub-sublessor an unconditional,
irrevocable standby Letter of Credit in the amount of one hundred eighty-eight
thousand four hundred forty-eight dollars and 00/100 ($188,448.00) in favor of
Sub-sublessor and issued by a bank located in the Bay Area and reasonably
acceptable to Sub-sublessor and for the term of one year and automatically
renewed each year for the term of the Sub-sublease ("Letter of Credit"). The
Letter of Credit shall secure all Sub-sublessee's performance of the terms and
conditions of the Sub-sublease and is an additional security deposit subject
to Paragraph 4.1 above. The Letter of Credit will automatically renew each
year during the Sub-sublease term unless the beneficiary under the Letter of
Credit is given at least thirty (30) days prior notice of a non-renewal by the
issuing bank, and Sub-sublessor shall be able to draw on the Letter of Credit
in the event of such notice.

                                  ARTICLE 5

                            CONDITION OF PREMISES

     5.1  Condition of the Sub-subleased Premises. Sub-sublessee acknowledges
          ---------------------------------------
that Sections 2.2 and 2.3 of the Master Lease are not incorporated herein and
that as of the Commencement Date, the Sub-subleased Premises, and every part
thereof, are in good condition and without need of repair, and Sub-sublessee
accepts the Sub-subleased Premises "as is", Sub-sublessee having made all
investigations and tests it has deemed necessary or desirable in order to
establish to its own complete satisfaction the condition of the Sub-subleased
Premises. Sub-sublessee accepts the Sub-subleased Premises in their condition
existing as of the Commencement Date, subject to all applicable zoning,
municipal, county and state laws, ordinances, and regulations governing and
regulating the use of the Sub-subleased Premises and any covenants or
restrictions of record. Sub-sublessee acknowledges that neither Sub-sublessor,
Master Sublessor nor Master Lessor have made any representation or warranties
as to the condition of the Sub-subleased Premises or its present or future
suitability for Sub-sublessee's purposes.

     5.2  Sub-sublessor Representation of Condition.  Sub-sublessor warrants
          -----------------------------------------
that at the Commencement Date the existing equipment and building systems,
including, without limitation, the plumbing, electrical, and HVAC system shall
be in good working order, that the carpets in the Sub-Subleased Premises have
been steam cleaned, and that there are no damaged ceiling tiles. If a non-
compliance with said warranty exists at the time of the Commencement Date, Sub-
sublessor shall, except as otherwise provided in this Sublease, promptly,
after receipt of written notice from Sub-sublessee setting forth with
specificity the nature and extent of such non-compliance, rectify same at Sub-
sublessor's expense. If Sub-sublessee does not give Sub-sublessor written
notice of a non-compliance with this warranty within thirty (30) days after
the later of the Commencement Date or the date Sub-sublessor delivers
possession to Sub-sublessee of the entire Sub-subleased Premises, correction
of such non-compliance shall be the obligation of Sub-sublessee at Sub-
sublessee's sole cost and expenses. Notwithstanding anything to the contrary
in this paragraph or elsewhere in this Sub-sublease, Sub-sublessee shall have
no

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obligation to perform any alteration, modification or improvement to the Sub-
subleased Premises which is required by law and is of a structural or capital
nature unless such alteration, modification or improvement is required due to
either Sub-sublessee's: (i) particular use; or (ii) alterations to the Sub-
subleased Premises by Sub-sublessee.

     5.3  Surrender.  Sub-sublessee shall keep the Sub-subleased Premises, and
          ---------
every part thereof in good order and repair. In addition to Sub-sublessee's
requirements under the Master Sublease and Master Lease, Sub-sublessee shall
surrender to Sub-subleased Premises in the same condition as received, ordinary
wear and tear and damage due to casualty excepted.

                                  ARTICLE 6

                                  INSURANCE

     6.1  Sub-sublessee's Insurance.  With respect to the Lessee's insurance
          -------------------------
under the Master Lease, the same is to be provided by Sub-sublessee as described
in the Master Lease, and such policies of insurance shall include as named
insureds Master Sublessor, Master Lessor, Sub-sublessor and any lender as
required by Master Lessor.

     6.2  Waiver of Subrogation.  With respect to the waiver of subrogation
          ---------------------
contained in Section 8.6 the Master Lease, such waiver shall be deemed to be
modified to constitute an agreement by and among Master Sublessor, Master
Lessor, Sub-sublessor and Sub-sublessee (and Master Sublessor's and Master
Lessor's consent to this Sub-sublease shall be deemed to constitute their
approval of this modification).

     6.3  Indemnity.  With respect to the indemnity contained in Section 8.7 of
          ---------
the Master Lease, Sub-sublessee shall indemnify Sub-sublessor, Master Sublessor
and Master Lessor.

     6.4  Exemption of Sub-Sublessor's Liability. With respect to the exemption
          --------------------------------------
from liability contained in Section 8.8 of the Master Lease, such exception from
liability shall apply to Sub-Sublessor as to Sub-Sublessee.

                                  ARTICLE 7

                   USE OF PREMISES; PARKING; IMPROVEMENTS

     7.1  Use of Premises.  Sub-sublessee shall use the Sub-subleased Premises
          ---------------
only for general office, administrative, light assembly, research and
development, engineering, warehouse and other legal related uses.

     7.2  Alterations; Improvements.
          -------------------------

          (a) Except as set forth herein, Sub-sublessee shall not make any
alterations, improvements, or modifications to the Sub-subleased Premises
without the express prior written consent of Sub-sublessor, Master Sublessor and
of Master Lessor, which consent by Sub-sublessor shall be given in its
reasonable discretion. Sub-sublessor understands that Sub-sublessee intends to
request consent to the addition of offices and a conference room to the Sub-
subleased Premises and Sub-sublessor will reasonably consent to such request.

                                       6
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          (b) Sub-sublessor, at Sub-sublessor's sole cost, shall make the
following improvements to the Sub-subleased Premises, subject to Master
Sublessor's and Master Lessor's approval; (i) construct a demising wall pursuant
to the site plan, which is attached hereto as Exhibit "C", and incorporated by
reference herein; (ii) remove the wood fence on the Sub-subleased Premises;
(iii) landscape where the wood fence previously stood; and (iv) remove the back
wall of the lobby in the Sub-subleased Premises to create an exit. Sub-sublessor
warrants that the improvements constructed by Sub-sublessor pursuant to this
Paragraph 7.2(b) shall be done in a first class workman-like manner with good
materials and in accordance with the site plan or other plans and
specifications, if applicable, and be in compliance with all applicable rules,
regulations, ordinances, statutes, and laws.

          (c) On termination of this Sub-sublease, Sub-sublessee shall remove
any or all improvements constructed by Sub-sublessee and to restore the Sub-
subleased Premises (or any part thereof) to the same condition as of the
Commencement Date of this Sub-sublease, reasonable wear and tear excepted or as
otherwise instructed in writing by either Sub-sublessor or Master Lessor.
Should Sub-sublessee fail to remove such improvements and restore the Sub-
subleased Premises on termination of this Sub-sublease unless instructed
otherwise in writing as set forth above, Sub-sublessor shall have the right to
do so, and charge Sub-sublessee therefore, plus an administrative charge of ten
percent (10%).

     7.3  Parking.  So long as Sub-sublessee is not in default and subject to
          -------
the rules and regulations imposed from time to time by Master Lessor or Sub-
sublessor, Sub-sublessee shall have the right to the non-exclusive use of sixty-
three (63) parking spaces in the common parking area, at no additional cost.

     7.4  Roof Rights.  Sub-sublessee shall have a non-exclusive right at no
          -----------
additional rent, to utilize roof space and Building conduits to maintain
satellite dishes or antenna devise on the roof, at Sub-sublessee's expense, so
long as such dishes and devise do not interfere with Sub-sublessor's equipment.

                                  ARTICLE 8

                    ASSIGNMENT, SUBLETTING & ENCUMBRANCE

     8.1  Consent Required.  Sub-sublessee shall not assign this Lease or any
          ----------------
interest therein nor shall Sub-sublessee sublet, license, encumber or permit the
Sub-subleased Premises or any part thereof to be used or occupied by others,
without Sub-sublessor's, Master Sublessor's and Master Lessor's prior written
consent which as to Sub-sublessor shall not be unreasonably withheld. The
consent by Sub-sublessor, Master Sublessor and Master Lessor to any assignment
or subletting shall not waive the need for Sub-sublessee (and Sub-sublessee's
assignee or subtenant) to obtain the consent of Sub-sublessor, Master Sublessor
and Master Lessor to any different or further assignment or subletting. All the
terms and conditions in the Master Lease and Master Sublease regarding
assignments and subletting shall apply, and to the extent there is any Bonus
Rents, (Rent paid by such Assignee or SubSub-sublessee in excess of Rent paid by
Sub-sublessee hereunder) the Bonus Rent shall first be split per the Master
Lease and Master Sublease and any Bonus Rent to go to Sub-sublessee shall be
split 50/50 with Sub-sublessor to be paid to Sub-sublessor within five (5) days
of receipt by Sub-sublessee.

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     8.2  Form of Document.  Every assignment, agreement, or Sub Sub-sublease
          ----------------
shall (i) recite that it is and shall be subject and subordinate to the
provisions of this Sub-sublease, that the assignee or subtenant assumes Sub-
sublessee's obligation hereunder, that the termination of this Sub-sublease
shall at Sub-sublessor's sole election, constitute a termination of every such
assignment or subsub-sublease.

     8.3  No Release of Sub-sublessee.  Regardless of Sub-sublessor's consent,
          ---------------------------
no subletting or assignment shall release Sub-sublessee of Sub-sublessee's
obligation or alter the primary liability of Sub-sublessee to pay the Rent and
to perform all other obligations to be performed by Sub-sublessee hereunder.
The acceptance of Rent by Sub-sublessor from any other person shall not be
deemed to be a waiver by Sub-sublessor of any provision hereof.  In the event of
default by any assignee, subtenant or any other successor of Sub-sublessee, in
the performance of any of the terms hereof, Sub-sublessor may proceed directly
against Sub-sublessee without the necessity of exhausting remedies against such
assignee, subtenant or successor.

     8.4  Default.  An involuntary assignment shall constitute a default and
          -------
Sub-sublessor shall have the right to elect to terminate this Sub-sublease, in
which case this Sub-sublease shall not be treated as an asset of Sub-sublessee.

     8.5  Recapture.  Notwithstanding the foregoing, in the event Sub-sublessee
          ---------
requests Sub-sublessor's consent to sublet or assign all or portion of this Sub-
sublease, Sub-sublessor may in its sole discretion, elect to terminate this Sub-
sublease within fifteen (15) days after receipt of Sub-sublessee's request by
written notification to Sub-sublessee of such election, in which case the Sub-
sublease shall terminate effective thirty (30) days following such election.

     8.6  Permitted Transfers.  Notwithstanding anything to the contrary in this
          -------------------
Sub-sublease, for the purposes of this Article 8, as to Sub-Sublessor's consent
only, the terms "assignment" and "subletting" shall not be deemed to include (i)
the trading of Sub-sublessee's stock on a nationally recognized exchange or
pursuant to an initial public offering or (ii) any assignment or other transfer
to an entity which controls, is controlled by or is under common control with
Sub-sublessee of any successor to Sub-sublessee or which succeeds to
substantially all of Sub-sublessee's assets and business by merger,
consolidation, reorganization or purchase (hereinafter collectively referred to
as "Corporate Transfers"). In addition, Sub-sublessor's right to terminate this
Sub-sublease pursuant to Paragraph 8.5 shall not be exercisable with respect to
Corporate Transfers. Sub-sublessee shall give Sub-sublessor written notice at
least ten (10) days prior to the effective date of such Corporate Transfer and
to the extent consent is required under the Sublease or Master Lease of Master
Sublessor or Master Lessor, any Corporate Transfers will be subject to such
consents. As used herein, the terms "controlled" or "controls" or "control"
shall mean ownership of at least fifty-one percent (51%) of voting control of
the relevant entity.

                                       8
<PAGE>

                                  ARTICLE 9

                                   DEFAULT

     9.1  Default Described.  The occurrence of any of the following shall
          -----------------
constitute a material breach of this Sub-sublease and a default by Sub-
sublessee: (i) failure to pay Rent or any other amount within three (3) business
days after due; (ii) all those items of default set forth in the Master Lease
and Master Sublease which remain uncured after the cure period provided in the
Master Lease and Master Sublease; or (iii) Sub-sublessee's failure to perform
timely and subject to any cure periods any other material provision of this Sub-
sublease or the Master Sublease or the Master Lease as incorporated herein.

     9.2  Sub-sublessor's Remedies.  Sub-sublessor shall have the remedies set
          ------------------------
forth in the Master Lease as if Sub-sublessor is Master Lessor and in the Master
Sublease as if Sub-sublessor is the Sublessor.  These remedies are not
exclusive; they are cumulative and in addition to any remedies now or later
allowed by law.

     9.3  All Sums Due and Payable as Rent.  Sub-sublessee shall also pay
          --------------------------------
without notice, or where notice is required under this Sub-sublease, immediately
upon demand without any abatement, deduction, or setoff, as additional rent all
sums, impositions, costs, expenses, and other payments which Sub-sublessee in
any of the provisions of this Sub-sublease assumes or agrees to pay, and, in
case of any nonpayment thereof, Sub-sublessor shall have, in addition to all
other rights and remedies, all the rights and remedies provided for in this Sub-
sublease or by 1aw in the case of nonpayment of rent.

     9.4  Sub-sublessor Default.  For purposes of this Sub-sublease, Sub-
          ---------------------
sublessor shall not be deemed in default hereunder unless and until Sub-
sublessee shall first deliver to Sub-sublessor thirty (30) days' prior written
notice, and Sub-sublessor shall fail to cure said default within said thirty
(30) day period, or in the event Sub-sublessor shall reasonably require in
excess of thirty (30) days to cure said default, shall fail to commence said
cure with said thirty (30) day period, and thereafter diligently to prosecute
the same to completion.

     9.5  Notice of Event of Default under Master Sublease.  Sub-sublessor shall
          ------------------------------------------------
notify Sub-sublessee of any Event of Default under the Master Sublease, or of
any other event of which Sub-sublessor has actual knowledge which will impair
Sub-sublessee's ability to conduct its normal business at the Sub-subleased
Premises, as soon as reasonably practicable following Sub-sublessor's receipt of
notice from Master Sublessor or Master Lessor of an Event of Default or Sub-
sublessor's actual knowledge of such impairment.

                                 ARTICLE 10

                CONSENT OF MASTER SUBLESSOR AND MASTER LESSOR

     10.1  Precondition. The Master Lease and Master Sublease requires that Sub-
           ------------
sublessor obtain the consent of Master Lessor and Master Sublessor to any
subletting by Sub-sublessor. This Sub-sublease shall not be effective unless and
until Master Lessor and Master Sublessor sign a consent to this subletting
satisfactory to Sub-sublessor and Sub-sublessee. Sub-sublessor

                                       9
<PAGE>

shall use its commercially reasonable efforts to obtain Master Lessor's and
Master Sublessor's consent to this Sub-sublease.

                                 ARTICLE 11

                                MISCELLANEOUS

     11.1  Conflict with Master Sublease and Master Lease: Interpretation.  In
           --------------------------------------------------------------
the event of any conflict between the provisions of the Master Sublease and
Master Lease and this Sub-sublease, the Master Sublease and Master Lease shall
govern and control except to the extent directly contradicted by the terms of
this Sub-sublease. No presumption shall apply in the interpretation or
construction of this Sub-sublease as a result of Sub-sublessor having drafted
the whole or any part hereof.

     11.2  Remedies Cumulative. The rights, privileges, elections, and remedies
           -------------------
of Sub-sublessor in this Sub-sublease, at law, and in equity are cumulative and
not alternative.

     11.3  Waiver of Redemption.  Sub-sublessee hereby expressly waives any and
           --------------------
all rights of redemption to which it may be entitled by or under any present or
future law in the event Sub-sublessor shall obtain a judgment for possession of
the Premises.

     11.4  Holding Over. Sub-sublessee shall have no right to Holdover. If Sub-
           ------------
sublessee does not surrender and vacate the Sub-subleased Premises at Expiration
Date of this Sublease, Sub-sublessee shall be a tenant at sufferance and the
parties having agreed that the Rent shall be at a daily rate of two hundred
percent (200%) of the monthly Base Rent set forth in Article 3, divided by
thirty (30). In connection with the foregoing, Sub-sublessor and Sub-sublessee
agree that the reasonable rental value of the Sub-subleased premises following
the Expiration Date of the Sublease shall be the amounts set forth above per
month. Sub-sublessor and Sub-sublessee acknowledge and agree that, under the
circumstances existing as of the Effective Date, it is impracticable and/or
extremely difficult to ascertain the reasonable rental value of the Sub-
subleased Premises on the Expiration Date and that the reasonable rental value
established herein is a reasonable estimate of the damage that Sub-sublessor
would suffer as the result of the failure of Sub-sublessee to timely surrender
possession of the Sub-subleased Premises. The parties acknowledge that the
liquidated damages established herein is not intended as a forfeiture or penalty
within the meaning of California Civil Code sections 3275 or 3369, but is
intended to constitute liquidated damages to Sub-sublessor pursuant to
California Civil Code sections 1671, 1676, and 1677. Notwithstanding the
foregoing, and in addition to all other rights and remedies on the part of Sub-
sublessor if Sub-sublessee fails to surrender the Premises upon the termination
or expiration of this Lease, in addition to any other liabilities to Sub-
sublessor accruing therefrom, Sub-sublessee shall indemnify, defend and hold
Sub-sublessor harmless from all claims resulting from such failure, including,
without limitation, any claims by any third parties based on such failure to
surrender and any lost profits to Sub-sublessor resulting therefrom.

     11.5  Signage.  Sub-sublessee shall not place any signs on or about the
           -------
Sub-Sub-subleased Premises without Sub-sublessor's, Master Sublessor's and
Master Lessor's prior written consent. All signs shall be at Sub-sublessee's
sole cost and shall comply with all rules, regulations, ordinances, covenants,
conditions, statutes and other laws whether federal, state,

                                       10
<PAGE>

local, quasi-governmental or otherwise affecting the Sub-subleased Premises,
at all times during the term hereof. Sub-sublessee acknowledges and agrees
that its request for consent to signage shall be limited to signage at the Sub-
subleased Premises.

     11.6  Sub-Sublessee's Access.  With respect to the access contained in
           ----------------------
Section 32 of the Master Lease, such access to the Sub-Sublessee Premises shall
apply to Sub-Sublessor. Notwithstanding the foregoing, any entry by Sub-
sublessor or any of its agents or representatives shall be subject to Sub-
sublessee's security requirements (which the parties acknowledge will be
extensive, due to the extremely sensitive and confidential nature of Sub-
sublessee's business), including but not limited to, the requirement that a
representative of Sub-sublessee accompany such party when in certain parts of
the Sub-subleased Premises. Sub-sublessor will use its reasonable efforts to get
Master Sublessor and Master Lessor to comply with such security requirements.

     11.7  Notice Periods.  Any notice or cure periods set forth in the Master
           --------------
Lease shall be reduced by one-half.

     11.8  Trash Removal Janitorial and Telephone Service.  Sub-sublessee, at
           ----------------------------------------------
Sub-sublessee's sole cost and expense, shall be responsible for its own trash
removal, and janitorial and telephone services to the Sub-subleased Premises.

                                 ARTICLE 12

                            BROKER'S COMMISSIONS

     12.1  Commission.  Sub-sublessor and Sub-sublessee represent and warrant to
           ----------
each other that each has dealt with the following brokers: B.T. Commercial (Sub-
sublessor's Broker) and CPS (Sub-sublessee's Broker) and with no other agent,
finder, or other such person with respect to this Sub-sublease and each agrees
to indemnify and hold the other harmless from any claim asserted against the
other by any broker, agent, finder, or other such person not identified above as
Sub-sublessor's Broker or Sub-sublessee's Broker. The Commission to the Brokers
is pursuant to separate agreement.

                                 ARTICLE 13

                             HAZARDOUS MATERIALS

     13.1  Hazardous Materials.  Notwithstanding anything contained herein or in
           -------------------
the Master Lease to the contrary, Sub-Sublessee shall not store, use, or dispose
of any Hazardous Material (as such is defined in the Master Lease) on, under, or
about the Sub-Subleased Premises.

     13.2  Indemnity.  Sub-Sublessee shall be solely responsible for and shall
           ---------
defend, indemnify and hold Sub-Sublessor and its partners, employees and agents
harmless from and against all claims, penalties, expenses and liabilities,
including attorneys' and consultants' fees and costs, to the extent arising out
of or caused in whole or in part, directly or indirectly, by or in connection
with its storage, use, disposal or discharge of Hazardous Materials whether in
violation of this section or not, or Sub-Sublessee's failure to comply with any
Hazardous Materials law. Sub-Sub lessee shall further be solely responsible for
and shall defend, indemnify

                                       11
<PAGE>

and hold Sub-Sublessor harmless from and against any and all claims, costs and
liabilities, including attorneys' and consultants' fees and costs, arising out
of or in connection with the removal, cleanup, detoxification, decontamination
and restoration work and materials necessary to return the Premises or the Sub-
Subleased Premises to their condition existing prior to Sub-Sublessee's
storage, use or disposal of the Hazardous Materials on the Premises or the Sub-
Subleased Premises. For the purposes of the indemnity provisions hereof, any
acts or omissions of Sub-Sublessee or by employees, agents, assignees,
contractors or subcontractors of Sub-sublessee (whether or not they are
negligent, intentional or unlawful) shall be strictly attributable to Sub-
Sublessee. Sub-Sublessee's obligations under this section shall survive the
termination of this Sub-Sublease.

     13.3  Indemnity.  Sub-sublessor represents and warrants to Sub-sublessee
           ---------
that to the best of Sub-sublessor's knowledge, without independent investigation
or inquiry, as of the Commencement Date, no Hazardous Materials are present or
have been released on or under the Sub-subleased Premises. Sub-sublessor shall
indemnify, defend, and hold harmless Sub-sublessee harmless from any damage
suffered by Sub-sublessee arising out of any release or use of any Hazardous
Materials in, on or under the Sub-subleased Premises or the Building by Sub-
sublessor.

                                 ARTICLE 14

                            NOTICES AND PAYMENTS

     14.1  Certified Mail.  Any notice, demand, request, consent, approval,
           --------------
submittal or communication that either party desires or is required to give to
the other party or any other person shall be in writing and either served
personally or sent by prepaid, first-class certified mail or commercial
overnight delivery service.  Such notice shall be effective on the date of
actual receipt (in the case of personal service or commercial overnight
delivery service) or two days after deposit in the United States mail, to the
following addresses:

           Sub-sublessor at:

           GWcom, Inc.
           3141 Coronado Drive
           Santa Clara, CA 95054
           (408) 567-1888

           Sub-sublessee:  At the Sub-subleased Premises, whether or not Sub-
           sublessee has abandoned or vacated the Premises or notified the Sub-
           sublessor of any other address, with a copy to:

           _________________________________________________
           _________________________________________________
           _________________________________________________

                                       12
<PAGE>

                                 ARTICLE 15

                               ATTORNEYS' FEES

     15.1  Sub-sublessor Made Party to Litigation.  If Sub-sublessor becomes a
           --------------------------------------
party to any litigation brought by someone other than Sub-sublessee and
concerning this Sub-sublease, the Sub-subleased Premises, or Sub-sublessee's use
and occupancy of the Sub-subleased Premises to the extent, based upon any real
or alleged act or omission of Sub-sublessee or its authorized representatives,
Sub-sublessee shall be liable to Sub-sublessor for reasonable attorneys' fees
and court costs incurred by Sub-sublessor in the litigation.

     15.2  Certain Litigation Between the Parties.  In the event any action or
           --------------------------------------
proceeding at law or in equity or any arbitration proceeding be instituted by
either party, for an alleged breach of any obligation of Sub-sublessee or Sub-
sublessor under this Sub-sublease, to recover rent, to terminate the tenancy of
Sub-sublessee at the Sub-subleased Premises, or to enforce, protect, or
establish any right or remedy of a party to this Sub-sublease Agreement, the
prevailing party (by judgment or settlement) in such action proceeding shall be
entitled to recover as part of such action or proceeding such reasonable
attorneys' fees, expert witness fees, and court costs as may be fixed by the
court or jury, but this provision shall not apply to any cross-complaint filed
by anyone other than Sub-sublessor in such action or proceeding.

                                 ARTICLE 16

                                  EXHIBITS

     16.1  Exhibits and Attachments.  All exhibits and attachments to this
           ------------------------
Sub-sublease are a part hereof.

                                 ARTICLE 17

                                COUNTERPARTS

     17.1  Counterparts.  This agreement may be executed in counterparts, each
           ------------
of which shall be deemed to be an original, but such counterparts; when taken
together, shall constitute but one agreement. In addition, an executed copy
hereof received by facsimile transmission shall be effective as an original for
all purposes.

                                       13
<PAGE>

     IN WITNESS WHEREOF, Sub-sublessor and Sub-sublessee have executed and
delivered this Sub-sublease on the date first set forth above.

SUB-SUBLESSOR                           SUB-SUBLESSEE

GW COM, INC.                            ALIGN TECHNOLOGY, INC.,
a Delaware corporation                  a Delaware corporation

                                        /s/ ZIA CHISHTI
---------------------------------       -----------------------------------

By:                                     By: Zia Chishti
    -----------------------------           -------------------------------

Its:                                    Its: CEO
     ----------------------------            ------------------------------

                                        By:
                                            -------------------------------

                                        Its:
                                             ------------------------------

                                       14<PAGE>

                                                                    Exhibit 10.9

                          LOAN AND SECURITY AGREEMENT

     THIS AGREEMENT (the "Agreement"), dated as of April 12, 1999 is entered
into by and between Align Technology Inc., a Delaware corporation having a
principal place of business at 442 Potrero Ave., Sunnyvale, CA 94086 (the
"Borrower") and Comdisco, Inc., a Delaware corporation having a principal place
of business at 6111 North River Road, Rosemont, Illinois 60018 (the "Lender").
In consideration of the mutual agreements contained herein, the parties hereto
agree as follows:

     WHEREAS, Borrower desires to borrow from the Lender hereunder the amount of
FIVE MILLION and 00/100 DOLLARS ($5,000,000.00) in minimum installments of ONE
MILLION and 00/100 DOLLARS ($1,000,000.00) each (as the same may from time to
time be amended, modified, supplemented or revised, the "Loan"), which would be
evidenced by Secured Promissory Notes(s) executed by Borrower substantially in
the form of Exhibit A hereto (as the same may from time to time be amended,
modified, supplemented or restated the "Note(s)").

     NOW, THEREFORE, it is agreed:

SECTION 1. DEFINITIONS

     Unless otherwise defined herein, the following capitalized terms shall have
the following meanings (such meanings being equally applicable to both the
singular and plural form of the terms defined):

     1.1  "Account" means any "account," as such term is defined in Section 9106
of the UCC, now owned or hereafter acquired by Borrower or in which Borrower now
holds or hereafter acquires any interest and, in any event, shall include,
without limitation, all accounts receivable, book debts and other forms of
obligations (other than forms of obligations evidenced by Chattel Paper,
Documents or Instruments) now owned or hereafter received or acquired by or
belonging or owing to Borrower (including, without limitation, under any trade
name, style or division thereof) whether arising out of goods sold or services
rendered by Borrower or from any other transaction, whether or not the same
involves the sale of goods or services by Borrower (including, without
limitation, any such obligation which may be characterized as an account or
contract right under the UCC) and all of Borrower's rights in, to and under all
purchase orders or receipts now owned or hereafter acquired by it for goods or
services, and all of Borrower's rights to any goods represented by any of the
foregoing (including, without limitation, unpaid seller's rights of rescission,
replevin, reclamation and stoppage in transit and rights to returned, reclaimed
or repossessed goods), and all monies due or to become due to Borrower under all
purchase orders and contracts for the sale of goods or the performance of
services or both by Borrower (whether or not yet earned by performance on the
part of Borrower or in connection with any other transaction), now in existence
or hereafter occurring, including, without limitation, the right to receive the
proceeds of said purchase orders and contracts, and all collateral security and
guarantees of any kind given by any Person with respect to any of the foregoing.

     1.2  "Account Debtor" means any "account debtor," as such term is defined
in Section 9105(1)(a) of the UCC.

Blanket Loan and Security Agr.
                                      -1-
<PAGE>

     1.3  "Advance" means each installment made by the Lender to Borrower
pursuant to the Loan to be evidenced by the Note(s) secured by the Collateral.

     1.4  "Advance Date" means the funding date of any Advance of the Loan.

     1.5. "Advance Request" means the request by Borrower for an Advance under
the Loan, each to be substantially in the form of Exhibit B attached hereto, as
submitted by Borrower to Lender from time to time.

     1.6  "Chattel Paper" means any "chattel paper," as such term is defined in
Section 9105(l)(b) of the UCC, now owned or hereafter acquired by Borrower or in
which Borrower now holds or hereafter acquires any interest.

     1.7  "Closing Date" means the date of this Agreement.

     1.8  "Collateral" shall have the meaning assigned to such term in Section 3
of this Agreement.

     1.9  "Commitment Amount" means Five Million Dollars ($5,000,000).

     1.10 "Contracts" means all contracts, undertakings, franchise agreements or
other agreements (other than rights evidenced by Chattel Paper, Documents or
Instruments) in or under which Borrower may now or hereafter have any right,
title or interest, including, without limitation, with respect to an Account,
any agreement relating to the terms of payment or the terms of performance
thereof.

     1.11 "Copyrights" means all of the following now owned or hereafter
acquired by Borrower or in which Borrower now holds or hereafter acquires any
interest: (i) all copyrights, whether registered or unregistered, held pursuant
to the laws of the United States, any State thereof or of any other country;
(ii) registrations, applications and recordings in the United States Copyright
Office or in any similar office or agency of the United States, any state
thereof or any other country; (iii) any continuations, renewals or extensions
thereof; and (iv) any registrations to be issued in any pending applications.

     1.12 "Copyright License" means any written agreement granting any right to
use any Copyright or Copyright registration now owned or hereafter acquired by
Borrower or in which Borrower now holds or hereafter acquires any interest.

     1.13 "Documents" means any "documents," as such term is defined in Section
9105(l)(f) of the UCC, now owned or hereafter acquired by Borrower or in which
Borrower now holds or hereafter acquires any interest.

     1.14 "Equipment" means any "equipment," as such term is defined in Section
9109(2) of the UCC, now or hereafter owned or acquired by Borrower or in which
Borrower now holds or hereafter acquires any interest and any and all additions,
substitutions and replacements of any of the foregoing, wherever located,
together with all attachments, components, parts, equipment and accessories
installed thereon or affixed thereto.

Blanket Loan and Security Agr.

                                      -2-
<PAGE>

     1.15 "Facility Fee" means one percent (1.0%) of the principal amount of the
Loan, along with the due diligence, transaction, and legal expense fee in the
amount of $7,500.00, due at the Closing Date, less commitment fee in the amount
of $20,000.00 paid with check no. 7516.

     1.16 "Fixtures" means any "fixtures", as such term is defined in Section
9313(1)(a) of the UCC, now or hereafter owned or acquired by Borrower or in
which Borrower now holds or hereafter acquires any interest and, now or
hereafter attached or affixed to or constituting a part of, or located in or
upon, real property wherever located, together with all right, title and
interest of Borrower in and to all extensions, improvements, betterments,
renewals, substitutes, and replacements of, and all additions and appurtenances
to any of the foregoing property, and all conversions of the security
constituted thereby, immediately upon any acquisition or release thereof or any
such conversion, as the case may be.

     1.17 "General Intangibles" means any "general intangibles," as such term is
defined in Section 9106 of the UCC, now owned or hereafter acquired by Borrower
or in which Borrower now holds or hereafter acquires any interest and, in any
event, shall include, without limitation, all right, title and interest which
Borrower may now or hereafter have in or under any contract, all customer lists,
Copyrights, Trademarks, Patents, rights to Intellectual Property, interests in
partnerships, joint ventures and other business associations, Licenses, permits,
trade secrets, proprietary or confidential information, inventions (whether or
not patented or patentable), technical information, procedures, designs,
knowledge, know-how, software, data bases, data, skill, expertise, recipes,
experience, processes, models, drawings, materials and records, goodwill
(including, without limitation, the goodwill associated with any Trademark,
Trademark registration or Trademark licensed under any Trademark License),
claims in or under insurance policies, including unearned premiums,
uncertificated securities, cash and other forms of money or currency, deposit
accounts (including as defined in Section 9105(e) of the UCC), rights to sue for
past, present and future infringement of Copyrights, Trademarks and Patents,
rights to receive tax refunds and other payments and rights of indemnification.

     1.18 "Instruments" means any "instrument," as such term is defined in
Section 9105(1)(i) of the UCC, now owned or hereafter acquired by Borrower or in
which Borrower now holds or hereafter acquires any interest.

     1.19 "Intellectual Property" means all Copyrights, Trademarks, Patents,
rights to Intellectual Property, Licenses, trade secrets, source codes, customer
lists, proprietary or confidential information, inventions (whether or not
patented or patentable), technical information, procedures, designs, knowledge,
know-how, software, data bases, skill, expertise, experience, processes, models,
drawings, materials and records.

     1.20 "Inventory" means any "inventory," as such term is defined in Section
9109(4) of the UCC, wherever located, now or hereafter owned or acquired by
Borrower or in which Borrower now holds or hereafter acquires any interest, and,
in any event, shall include, without limitation, all inventory, goods and other
personal property which are held by or on behalf of Borrower for sale or lease
or are furnished or are to be furnished under a contract of service or which
constitute raw materials, work in process or materials used or consumed or to be
used or consumed in Borrower's business, or the processing, packaging,
promotion, delivery or shipping of the same, and all furnished goods whether or
not such inventory is listed on any schedules, assignments or reports furnished
to Lender from time to time and whether or not the

Blanket Loan and Security Agr.

                                      -3-
<PAGE>

same is in transit or in the constructive, actual or exclusive occupancy or
possession of Borrower or is held by Borrower or by others for Borrower's
account, including, without limitation, all goods covered by purchase orders and
contracts with suppliers and all goods billed and held by suppliers and all
inventory which may be located on premises of Borrower or of any carriers,
forwarding agents, truckers, warehousemen, vendors, selling agents or other
persons.

     1.21 "License" means any Copyright License, Patent License, Trademark
License or other license of rights or interests now held or hereafter acquired
by Borrower or in which Borrower now holds or hereafter acquires any interest
and any renewals or extensions thereof.

     1.22 "Lien" means any mortgage, deed of trust, pledge, hypothecation,
assignment for security, security interest, encumbrance, levy, lien or charge of
any kind, whether voluntarily incurred or arising by operation of law or
otherwise, against any property, any conditional sale or other title retention
agreement, any lease in the nature of a security interest, and the filing of any
financing statement (other than a precautionary financing statement with respect
to a lease that is not in the nature of a security interest) under the UCC or
comparable law of any jurisdiction.

     1.23 "Material Adverse Effect" means a material adverse effect upon: (i)
the business, operations, properties, assets or financial conditions of
Borrower; or (ii) the ability of Borrower to perform, or of Lender to enforce,
the Secured Obligations.

     1.24 "Maturity Date" means the date thirty six (36) months from the Advance
Date of each installment of the Loan.

     1.25 "Patent License" means any written agreement granting any right with
respect to any invention on which a Patent is in existence now owned or
hereafter acquired by Borrower or in which Borrower now holds or hereafter
acquires any interest.

     1.26 "Patents" means all of the following now owned or hereafter acquired
by Borrower or in which Borrower now holds or hereafter acquires any interest:
(a) letters patent of, or rights corresponding thereto in, the United States or
any other county, all registrations and recordings thereof, and all applications
for letters patent of, or rights corresponding thereto in the United States or
any other country, including, without limitation, registrations, recordings and
applications in the United States Patent and Trademark Office or in any similar
office or agency of the United States, any State thereof or any other country;
(b) all reissues, continuations, continuations-in-part or extensions thereof;
(c) all petty patents, divisionals, and patents of addition; and (d) all patents
to issue in any such applications.

     1.27 "Permitted Liens" means:

               (i)  liens in favor of Lender;

               (ii) liens securing the payment of taxes or other governmental
     charges not yet delinquent or being contested in good faith by appropriate
     proceeding, for which adequate reserves are maintained in accordance with
     generally accepted accounting principles;

Blanket Loan and Security Agr.

                                      -4-
<PAGE>

          (iii)     liens securing claims or demands of materialism, mechanics,
     carriers, warehousemen, landlords and other like persons imposed without
     action of such parties, provided that the payment thereof is not yet
     required;

          (iv)      liens incurred or deposits made in the ordinary course of
     Borrower's or a subsidiary's business in connection with workers
     compensation, unemployment insurance, social security and other like laws;

          (v)       purchase money security interests in personal property
     acquired after the date of this Agreement, provided such are limited to the
     personal property so acquired and proceeds, thereof;

          (vi)      any liens existing as of the date hereof and specifically
     disclosed by Borrower to Lender herein;

          (vii)     leases, subleases, licenses and sublicenses granted to
     others in the ordinary course of business not interfering in any material
     respect with the conduct of the business of any Borrower;

          (viii)    liens arising from judgments, decrees or attachments to the
     extent and only so long as such judgment, decree or attachment as not
     caused or resulted in a Event of Default;

          (ix)      liens in favor of customs and revenue authorities arising as
     a matter of law to secure payment of customs duties in connection with the
     importation of goods;

          (x)       liens which constitute rights of set-off of a customary
     nature or bankers' liens with respect to amounts on deposit, whether
     arising by operation of law or by contract, in connection with arrangements
     entered into with banks in the ordinary course of business;

          (xi)      liens incurred in connection with the extension, renewal or
     refinancing of the indebtedness secured by liens of the type described in
     clause (vii) above, provided that any extensions, renewal or replacement
     lien shall be limited to the property encumbered by the existing lien and
     the principal amount of the indebtedness being extended, renewed or
     refinanced does not increase.

     1.28  "Proceeds" means "proceeds," as such term is defined in Section
9306(l) of the UCC and, in any event, shall include, without limitation, (a) any
and all Accounts, Chattel Paper, Instruments, cash or other forms of money or
currency or other proceeds payable to Borrower from time to time in respect of
the Collateral, (b) any and all proceeds of any insurance, indemnity, warranty
or guaranty payable to Borrower from time to time with respect to any of the
Collateral, (c) any and all payments (in any form whatsoever) made or due and
payable to Borrower from time to time in connection with any requisition,
confiscation, condemnation, seizure or forfeiture of all or any part of the
Collateral by any governmental authority (or any Person acting under color of
governmental authority), (d) any claim of Borrower against third parties (i) for
past, present or future infringement of any Copyright, Patent or Patent License
or (ii) for past, present or future infringement or dilution of any Trademark or
Trademark License or for injury to the goodwill associated with any Trademark,

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                                      -5-
<PAGE>

Trademark registration or Trademark licensed under any Trademark License and (e)
any and all other amounts from time to time paid or payable under or in
connection with any of the Collateral.

     1.29   "Receivables" shall mean and include all of the Borrowers accounts,
instruments, documents, chattel paper and general intangibles whether secured or
unsecured, whether now existing or hereafter created or arising, and whether or
not specifically sold or assigned to Lender hereunder.

     1.30   "Secured Obligations" shall mean and include all principal,
interest, fees, costs, or other liabilities or obligations for monetary amounts
owed by Borrower to Lender, whether due or to become due, matured or unmatured,
liquidated or unliquidated, contingent or non-contingent, and all covenants and
duties regarding such amounts, of any kind of nature, present or future, arising
under this Agreement, the Note(s), or any of the other Loan Documents, whether
or not evidenced by any Note(s), Agreement or other instrument, as the same may
from time to time be amended, modified, supplemented or restated.

     1.31   "Trademark License" means any written agreement granting any right
to use any Trademark or Trademark registration now owned or hereafter acquired
by Borrower or in which Borrower now holds or hereafter acquires any interest.

     1.32   "Trademarks" means any of the following now owned or hereafter
acquired by Borrower or in which Borrower now holds or hereafter acquires any
interest: (a) any and all trademarks, tradenames, corporate names, business
names, trade styles, service marks, logos, other source or business identifiers,
prints and labels on which any of the foregoing have appeared or appear, designs
and general intangibles of like nature, now existing or hereafter adopted or
acquired, all registrations and recordings thereof, and any applications in
connection therewith, including, without limitation, registrations, recordings
and applications in the United States Patent and Trademark Office or in any
similar office or agency of the United States, any State thereof or any other
country or any political subdivision thereof and (b) any reissues, extensions or
renewals thereof.

     1.33   "UCC" shall mean the Uniform Commercial Code as the same may, from
time to time, be in effect in the State of Illinois. Unless otherwise defined
herein, terms that are defined in the UCC and used herein shall have the
meanings given to them in the UCC.

     1.34   "Warrant Agreement(s)" shall mean those agreements entered into in
connection with the Loan, substantially in the form attached hereto as Exhibit C
pursuant to which Borrower granted Lender the right to purchase 266,667 shares
of Series B Preferred Stock of Borrower at an Exercise Price of $3.00 per share
as more particularly set forth therein.

SECTION 2.  THE LOAN

      2.1   Subject to the terms and conditions set forth herein, Lender shall
make Loans to Borrower in an aggregate amount not to exceed the Commitment
Amount. Each Advance, together with interest at the rate of twelve percent (12%)
per annum, shall be payable in 36 monthly installments as set forth in the
Note(s).

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                                      -6-
<PAGE>

          2.2 Upon the occurrence of and during an Event of Default (as defined
herein), interest shall thereafter be calculated at a rate of five percent (5%)
in excess of the rate that would otherwise be applicable ("Default Rate"). All
such interest shall be due and payable in arrears, on the first day of the
following month.

          2.3 Notwithstanding any provision in this Agreement, the Note(s), or
any other "Loan Document" (as defined herein), it is not the parties' intent to
contract for, charge or receive interest at a rate that is greater than the
maximum rate permissible by law which a court of competent jurisdiction shall
deem applicable hereto (which under the laws of the State of Illinois shall be
deemed to be the laws relating to permissible rates of interest on commercial
loans) (the "Maximum Rate"). If the Borrower actually pays Lender an amount of
interest, chargeable on the total aggregate principal Secured Obligations of
Borrower under this Agreement and the Note(s) (as said rate is calculated over a
period of time that is the longer of (i) the time from the date of this
Agreement through the maturity time as set forth on the Note(s), or (ii) the
entire period of time that any principal is outstanding on the Note(s)), which
amount of interest exceeds interest calculated at the Maximum Rate on said
principal chargeable over said period of time, then such excess interest
actually paid by Borrower shall be applied first, to the payment of principal
                                           -----
outstanding on the Note(s); second, after all principal is repaid, to the
                            ------
payment of Lender's out of pocket costs, expenses, and professional fees which
are owed by Borrower to Lender under this Agreement or the Loan Documents; and
third, after all principal, costs, expenses, and professional fees owed by
-----
Borrower to Lender are repaid, the excess (if any) shall be refunded to
Borrower.

          2.4  In the event any interest is not paid when due hereunder,
delinquent interest shall be added to principal and shall bear interest on
interest, compounded at the rate set forth in Section 2.1.

          2.5  Upon and during the continuation of an Event of Default hereunder
(as defined herein), all Secured Obligations, including principal, interest,
compounded interest, and reasonable professional fees, shall bear interest at a
rate per annum equal to the Default Rate.

          2.6  Borrower shall have the option to prepay the Loan, in whole or in
part, without penalty or premium, after 12 months from the Closing Date by
paying the principal amount thereon together with all accrued and unpaid
interest with respect to such principal amount, as of the date of such
prepayment, without premium. In the event Borrower prepays the Note(s) within 12
months from the Closing Date hereof, Borrower shall pay the principal amount
together with all accrued and unpaid interest and a prepayment premium equal to
1% of the then outstanding principal amount ("the Prepayment Penalty"),
provided, however, in the event of an initial public offering of Borrower's
          -------
stock, the Prepayment Penalty shall not apply.

          2.7  If the Borrower has not repaid the outstanding principal amount
under the Loan in its entirety by the Maturity Date (as defined in the
applicable Note(s)), then for each additional month, or portion thereof,
thereafter that the outstanding principal is not paid, Lender shall have the
right to purchase from the Borrower, at the Exercise Price (adjusted, as set
forth and defined in the Warrant Agreement), an additional number of shares of
Preferred Stock (as defined in the Warrant Agreement) which number shall be
determined by (i) multiplying the outstanding principal amount which is due but
unpaid by 1% and (ii) dividing the product thereof by the Exercise Price.

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<PAGE>

         2.8 Notwithstanding anything in this Agreement to the contrary,
Lender's obligations to provide the Loan(s) shall terminate on the earlier of
(i) January 7, 2000 or (ii) the occurrence of a Material Adverse Effect pursuant
to Section 1.22, and no Advance Requests shall be accepted after such date,
unless otherwise waived by Lender ("Draw Period"). Notwithstanding the
foregoing, in the event the Borrower closes a private equity round for a minimum
of Ten Million and No/l00 Dollars ($l0,000,000.00) with a price per share no
less than $4.50 ("Next Round"), Borrower may request an extension of the Draw
Period for an additional nine (9) months ("Extended Draw Period"), such Extended
Draw Period will only be available upon: (i) written request by Borrower and
(ii) the issuance to Lender of a Series C Preferred Stock warrant for an
aggregate purchase price of $450,000 divided by the Exercise Price, with the
same terms and conditions as the Warrant Agreement defined herein and attached
hereto as Exhibit C. The Exercise Price shall be defined as equal to the price
per share of the Next Round.

SECTION 3. SECURITY INTEREST

          As security for the prompt, complete and indefeasible payment when due
(whether at stated payment dates or otherwise) of all the Secured Obligations
and in order to induce Lender to make the Loan upon the terms and subject to the
conditions of the Note(s), Borrower hereby assigns, conveys, mortgages, pledges,
hypothecates and transfers to Lender for security purposes only, and hereby
grants to Lender a security interest in, all of Borrower's right, title and
interest in, to and under each of the following (all of which being hereinafter
collectively called the "Collateral"):

          (a)  All Receivables;

          (b)  All Equipment;

          (c)  All Fixtures;

          (d)  All General Intangibles;

          (e)  All Inventory;

          (f)  All other goods and personal property of Borrower whether
               tangible or intangible and whether now or hereafter owned or
               existing, leased, consigned by or to, or acquired by, Borrower
               and wherever located; and

          (g)  To the extent not otherwise included, all Proceeds of each of the
               foregoing and all accessions to, substitutions and replacements
               for, and rents, profits and products of each of the foregoing.

Notwithstanding the foregoing, Lender agrees to release all Receivables
necessary for the sole purpose of Borrower securing an accounts
receivable/factoring facility against executed firm orders with Orthodontists
and Dentists for Borrower's dental products, provided, however, Lender has the
right of first refusal to provide such receivable/factoring facility.

SECTION 4. REPRESENTATIONS AND WARRANTIES OF BORROWER

The Borrower represents, warrants and agrees that:

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                                      -8-
<PAGE>

          4.1  it has good title in and to the Collateral, free of all liens,
security interests, encumbrances and claims whatsoever, except for the interest
of the Lender therein;

         4.2   it has the full power and authority to, and does hereby grant and
convey to the Lender, a valid first priority perfected security interest in the
Collateral as security for the Secured Obligations, free of all liens, security
interests, encumbrances and claims, and shall execute such Uniform Commercial
Code financing statements in connection herewith as the Lender may reasonably
request. Except for Permitted Liens, no other lien, security interest, adverse
claim or encumbrance has been created by Borrower or is known by Borrower to
exist with respect to any Collateral;

         4.3   it is a corporation duly organized, legally existing and in good
standing under the laws of the State of Delaware, and is duly qualified as a
foreign corporation in all jurisdictions where the failure to so qualify would
have a Material Adverse Effect on the Collateral or the business of the Borrower
taken as a whole;

         4.4   the execution, delivery and performance of the Note(s), this
Agreement, the Warrant Agreement(s), and all financing statements, certificates
and other documents required to be delivered or executed in connection herewith
(collectively, the "Loan Documents") have been duly authorized by all necessary
corporate action of Borrower, the individual or individuals executing the Loan
Documents were duly authorized to do so, and the Loan Documents constitute
legal, valid and binding obligations of the Borrower, enforceable in accordance
with their respective terms, subject to applicable bankruptcy, insolvency,
reorganization or other similar laws generally affecting the enforcement of the
rights of creditors;

          4.5  the Loan Documents do not and will not violate any provisions of
its Certificate of Incorporation, bylaws or any material contract pr agreement,
law, regulation, order, injunction, judgment, decree or writ to which the
Borrower is subject, or result in the creation or imposition of any lien,
security interest or other encumbrance upon the Collateral, other than those
created by this Agreement;

          4.6  the execution, delivery and performance of the Loan Documents do
not require the consent or approval of any other person or entity including,
without limitation, any regulatory authority or governmental body of the United
States or any state thereof or any political subdivision of the United States or
any state thereof.

          4.7  as of the date hereof no fact or condition exists that would (or
could, with the passage of time, the giving of notice, or both) constitute an
Event of Default under this Agreement or any of the Loan Documents and no event
which has had or could reasonably be expected to have a Material Adverse Effect
has occurred and is continuing.

SECTION 5. INSURANCE AND RISK OF LOSS

          5.1  So long as there are any Secured Obligations outstanding,
Borrower shall cause to be carried and maintained commercial general liability
insurance against risks customarily insured against in Borrower's line of
business. Such risks shall include, without limitation, the risks of death,
bodily injury and property damage. So long as there are any Secured Obligations
outstanding, Borrower shall also cause to be carried and maintained insurance

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                                      -9-
<PAGE>

upon the Collateral and Borrower's business, covering casualty, hazard and such
other property risks in amounts equal to the full replacement cost of the
Collateral. Borrower shall deliver to Lender lender's loss payable endorsements
(Form BFU 438 or equivalent) naming Lender as loss payee and additional insured.
Borrower shall use commercially reasonable efforts to cause all policies
evidencing such insurance to provide for at least thirty (30) days prior written
notice by the underwriter or insurance company to Lender in the event of
cancellation or expiration. Such policies shall be issued by such insurers and
in such amounts as are reasonably acceptable to Lender.

     5.2  Borrower shall and does hereby indemnify and hold Lender, its agents
and shareholders harmless from and against any and all claims, costs, expenses,
damages and liabilities (including, without limitation, such claims, costs,
expenses, damages and liabilities based on liability in tort, including without
limitation, strict liability in tort), including reasonable attorneys' fees,
arising out of the disposition or utilization of the Collateral, other than
claims arising at or caused by Lender's gross negligence or willful misconduct.

SECTION 6. COVENANTS OF BORROWER

     Borrower covenants and agrees as follows at all times while any of the
Secured Obligations remain outstanding:

     6.1  Borrower shall furnish to Lender the financial statements listed
hereinafter, each prepared in accordance with generally accepted accounting
principles consistently applied (the "Financial Statements"):

          (a)  as soon as practicable (and in any event within thirty (30) days)
     after the end of each month, unaudited interim financial statements as of
     the end of such month (prepared on a consolidated and consolidating basis,
     if applicable), including balance sheet and related statements of income
     and cash flows accompanied by a report detailing any material contingencies
     (including the commencement of any material litigation by or against
     Borrower) or any other occurrence that could reasonably be expected to have
     a Material Adverse Effect, all certified by Borrower's Chief Executive
     Officer or Chief Financial Officer to be true and correct in all material
     respects;

          (b)  as soon as practicable (and in any event within ninety (90) days)
     after the end of each fiscal year, unqualified audited financial statements
     as of the end of such year (prepared on a consolidated and consolidating
     basis, if applicable), including balance sheet and related statements of
     income and cash flows, and setting forth in comparative form the
     corresponding figures for the preceding fiscal year, certified by a firm of
     independent certified public accountants selected by Borrower and
     reasonably acceptable to Lender, accompanied by any management report from
     such accountants;

          (c)  promptly after the sending or filing thereof, as the case may be,
     copies of any proxy statements, financial statements or reports which
     Borrower has made available to its shareholders and copies of any regular,
     periodic and special reports or registration statements which Borrower
     files with the Securities and Exchange Commission or any governmental
     authority which may be substituted therefor, or any national securities
     exchange; and

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                                     -10-

<PAGE>

          (d)  promptly, any additional information, financial or otherwise
     (including, but not limited, to tax returns and names of principal
     creditors) as Lender reasonably believes necessary to evaluate Borrower's
     continuing ability to meet its financial obligations.

     6.2  Borrower shall permit any authorized representative of Lender and its
attorneys and accountants on reasonable notice to inspect, examine and make
copies and abstracts of the books of account and records of Borrower at
reasonable times during normal business hours provided, that not more than two
such inspections or examinations shall take place in any calendar year except
upon the occurrence and continuation of an Event of Default. In addition, such
representative of Lender and its attorneys and accountants shall have the right
to meet with management and officers of the Company to discuss such books of
account and records.

     6.3  Borrower will from time to time execute, deliver and file, alone or
with Lender, any financing statements, security agreements or other documents;
procure any instruments or documents as may be reasonably requested by Lender;
and take all further action that may be necessary or desirable, or that Lender
may reasonably request, to confirm, perfect, preserve and protect the security
interests intended to be granted hereby, and in addition, and for such purposes
only, Borrower hereby authorizes Lender to execute and deliver on behalf of
Borrower and to file such financing statements, security agreement and other
documents without the signature of Borrower either in Lender's name or in the
name of Borrower as agent and attorney-in-fact for Borrower. The parties agree
that a carbon, photographic or other reproduction of this Agreement shall be
sufficient as a financing statement and may be filed in any appropriate office
in lieu thereof.

     6.4  Borrower shall protect and defend Borrower's title as well as the
interest of the Lender against all persons claiming any interest adverse to
Borrower or Lender and shall at all times keep the Collateral free and clear
from any legal process, liens or encumbrances whatsoever (except any placed
thereon by Lender and other Permitted Liens) and shall give Lender immediate
written notice thereof.

     6.5  Without Lender's prior written consent, such consent to be given no
later than four (4) days after Lender receives notice by Borrower, Borrower
shall not, outside the ordinary course of business, but not to exceed $250,000,
(a) grant any material extension of the time of payment of any of the
Receivables, (b) to any material extent, compromise, compound or settle the same
for less than the full amount thereof, (c) release, wholly or partly, any person
liable for the payment thereof, or allow any credit or discount whatsoever
thereon other than trade discounts granted in the ordinary course of business of
Borrower.

     6.6  Borrower shall maintain and protect its properties, assets and
facilities, including without limitation, its Equipment and Fixtures, in good
order and working repair and condition (taking into consideration ordinary wear
and tear) and from time to time make or cause to be made all necessary and
proper repairs, renewals and replacements thereto and shall competently manage
and care for its property in accordance with prudent industry practices.

     6.7  Borrower shall not merge with and into any other entity; or sell or
convey all or substantially all of its assets or stock to any other person or
entity without notifying Lender a minimum of twenty (20) days prior to the
closing date and requesting Lender's consent to the assignment of all of
Borrower's Secured Obligations hereunder to the successor entity in form

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                                      -11-
<PAGE>

and substance satisfactory to Lender. In the event Lender does not consent to
such assignment the parties agree Borrower shall prepay the Loan in accordance
with Section 2.6 hereof. Notwithstanding the foregoing, Lender hereby consents
to any Merger in which the surviving entity has cash and marketable securities
of at least ten (10) times the remaining Loan payments and Lender shall not
unreasonably withhold its consent to a Merger in other cases.

     For purposes of this Agreement, a "Merger" shall mean any consolidation or
merger of the Borrower with or into any other corporation or entity, any sale or
conveyance of an or substantially all of the assets or stock of the Borrower by
or to any other person or entity in which Borrower is not the surviving entity.

     6.8   Borrower shall not, without the prior written consent of Lender, such
consent not to be unreasonably withheld, declare or pay any cash dividend or
make a distribution on any class of stock, other than pursuant to employee
repurchase plans upon an employee's death or termination of employment or
transfer, sell, lease, lend or in any other manner convey any equitable,
beneficial or legal interest in any material portion of the assets of Borrower
(except inventory sold in the normal course of business).

     6.9   Upon the request of Lender, Borrower shall, during business hours,
make the Inventory and Equipment available to Lender for inspection at the place
where it is normally located and shall make Borrower's log and maintenance
records pertaining to the Inventory and Equipment available to Lender for
inspection. Borrower shall take all action necessary to maintain such logs and
maintenance records in a correct and complete fashion.

     6.10  Borrower covenants and agrees to pay when due, all taxes, fees or
other charges of any nature whatsoever (together with any related interest or
penalties) now or hereafter imposed or assessed against Borrower, Lender or the
Collateral or upon Borrower's ownership, possession, use, operation or
disposition thereof or upon Borrower's rents, receipts or earnings arising
therefrom. Borrower shall file on or before the due date therefor all personal
property tax returns in respect of the Collateral. Notwithstanding the
foregoing, Borrower may contest, in good faith and by appropriate proceedings,
taxes for which Borrower maintains adequate reserves therefor.

     6.11  Borrower shall not relocate any item of the Collateral (other than
sale of inventory in the ordinary course of business) except: (i) with prior
written notice of the Lender not to be unreasonably withheld; and (ii) if such
relocation shall be within the continental United States. If permitted to
relocate Collateral pursuant to the foregoing sentence, unless otherwise agreed
in writing by Lender, Borrower shall first (a) cause to be filed and/or
delivered to the Lender all Uniform Commercial Code financing statements,
certificates or other documents or instruments necessary to continue in effect
the perfected security interest of the Lender in the Collateral, and (b) have
given the Lender no less than fifteen (15) days prior written notice of such
relocation.

     6.12  Borrower shall not incur any indebtedness senior to Lender's position
without the prior written consent of Lender.

SECTION 7. CONDITIONS PRECEDENT TO LOAN

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                                      -12-
<PAGE>

     The obligation of Lender to fund the Loan on each Advance Date shall be
subject to Lender's discretion and satisfactory completion of its due diligence
and approval process, and satisfaction by Borrower or waiver by Lender, in
Lender's reasonable discretion, of the following conditions:

     7.1  Document Delivery. Borrower, on prior to the Closing Date, shall have
delivered to Lender the following:

          (a)  executed originals of the Agreement, the Warrant Agreement, and
     any documents reasonably required by Lender to effectuate the liens of
     Lender, with respect to all Collateral;

          (b)  certified copy of resolutions of Borrower's board of directors
     evidencing approval of the borrowing and other transactions evidenced by
     the Loans Documents;

          (c)  certified copies of the Certificate of Incorporation and the
     Bylaws of Borrower, as amended through the Closing Date;

          (d)  certificate of good standing for Borrower from its state of
     incorporation and similar certificates from all other jurisdictions in
     which it does business and where the failure to be qualified would have a
     Material Adverse Effect;

          (e)  payment of the Facility Fee less transaction and due diligence
     expenses (not to exceed $7,500) shall be applied to the Facility Fee; and

          (f)  such other documents as Lender may reasonably request.

     7.3  Advance Request.

          (a)  During Draw Period, Borrower, on or prior to each Advance Date,
     shall have delivered to Lender the following:

               (i)    a minimum of five (5) business days prior to the Advance
          Date, written notice in the form of an Advance Request, or as
          otherwise specified by Lender from time to time, specifying amount of
          such Advance and wire transfer instructions;

               (ii)   executed original of the Note(s); and

               (iii)  such other documents as Lender may reasonably request.

          (b)  During Extended Draw Period, Borrower on or prior to each Advance
     Date, shall have delivered to Lender the following:

               (i)    a minimum of five (5) business days to the Advance Date,
          written notice in the form of an Advance Request, or as otherwise
          specified by Lender from time to time, specifying amount of such
          Advance and wire instructions;

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                                     -13-
<PAGE>

          (ii)  executed original of the Note(s);

          (iii) a Warrant Agreement executed in accordance with Section 2.8
          herein, and in a form substantially identical to the Warrant Agreement
          attached hereto as Exhibit C, and

          (iv)  such other documents as Lender may reasonably request.

     7.4  Perfection of Security Interests. Borrower shall have taken or caused
to be taken such actions reasonably requested by Lender to grant Lender a first
priority perfected security interest in the Collateral. Such actions shall
include, without limitation, the delivery to Lender of all appropriate
financing statements, executed by Borrower, as to the Collateral granted by
Borrower for all jurisdictions as may be necessary or desirable to perfect the
security interest of Lender in such Collateral

     7.5  Absence of Events of Defaults. As of the Closing Date or the Advance
Date, no fact or condition exists that would (or would, with the passage of
time, the giving of notice, or both) constitute an Event of Default under this
Agreement or any of the Loan Documents.

     7.6  Material Adverse Effect. As of the Closing Date or the Advance Date,
no event which has had or could reasonably be expected to have a Material
Adverse Effect has occurred and is continuing.

SECTION 8. ASSIGNMENT BY LENDER

     8.1  Borrower acknowledges and understands that Lender may sell and assign
all or a part of its interest hereunder and under the Note(s) and Loan Documents
to any person or entity (an "Assignee"). After such assignment the term Lender
shall mean such Assignee, and such Assignee shall be vested with all rights,
powers and remedies of Lender hereunder with respect to the interest so
assigned; but with respect to any such interest not so transferred, the Lender
shall retain all rights, powers and remedies hereby given. No such assignment by
Lender shall relieve Borrower of any of its obligations hereunder. Borrower
shall acknowledge such assignment or assignments as shall be designated by
written notice given by Lender to Borrower. The Lender agrees that in the event
of any transfer by it of the Note(s), it will endorse thereon a notation as to
the portion of the principal of the Note(s) which shall have been paid at the
time of such transfer and as to the date to which interest shall have been last
paid thereon.

SECTION 9. DEFAULT

     The occurrence of any one or more of the following events (herein called
"Events of Default") shall constitute a default hereunder and under the Note(s):

     9.1  The Borrower defaults in the payment of any principal or interest
payable under the Note(s) and such default continues for more than five (5) days
after the due date thereof;

     9.2  The Borrower defaults in the payment or performance of any other
covenant or obligation of the Borrower hereunder or under the Note(s) or any
other Loan Documents for more than ten (10) days after the Lender has given
notice of such default to the Borrower;

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                                     -14-
<PAGE>

     9.3  Any representation or warranty as of the date made herein by the
Borrower shall prove to have been false or misleading in any material respect;

     9.4  The making of an assignment by Borrower for the benefit of its
creditors or the admission by Borrower in writing of its inability to pay its
debts as they become due, or the insolvency of Borrower, or the filing by
Borrower of a voluntary petition in bankruptcy, or the adjudication of Borrower
as a bankrupt, or the filing by Borrower of any petition or answer seeking for
itself any reorganization, arrangement, composition, readjustment, liquidation,
dissolution, or similar relief under any present or future statute, law or
regulation, or the filing of any answer by Borrower admitting, or the failure by
Borrower to deny, the material allegations of a petition filed against it for
any such relief, or the seeking or consenting by Borrower to, or acquiescence by
Borrower in, the appointment of any trustee, receiver or liquidator of Borrower
or of all or any substantial part of the properties of Borrower, or the
inability of Borrower to pay its debts when due, or the commission by Borrower
of any act of bankruptcy as defined in the Federal Bankruptcy Act, as amended;

     9.5  The failure by Borrower, within sixty (60) days after the commencement
of any proceeding against Borrower seeking any reorganization, arrangement,
composition, readjustment, liquidation, dissolution or similar relief under any
present or future statute, law or regulation, to obtain the dismissal of such
proceeding or, within sixty (60) days after the appointment, without the written
consent or acquiescence of Lender, of any trustee, receiver or liquidator of
Borrower or of all or any substantial part of the properties of Borrower, to
vacate such appointment;

     9.6  The default by Borrower under any other notes or other agreement
for borrowed money, lease or other agreement between Borrower and Lender; or

     9.7  The occurrence of any default under any lease or other agreement or
obligation of Borrower involving an amount in excess of $100,000.00 or having a
Material Adverse Effect; or the entry of any judgment against Borrower involving
an award in excess of $100,000.00 that would have a Material Adverse Effect,
that has not been bonded or stayed on appeal within thirty (30) days.

SECTION 10. REMEDIES

     Upon the occurrence and continuation hereof of any one or more Events of
Default, Lender, at its option, may declare the Note(s) to be accelerated and
immediately due and payable, (provided, that upon the occurrence of an Event of
Default of the type described in 9.4 or 9.5, the Note(s) and all other Secured
Obligations shall automatically be accelerated and made due and payable without
any further act) whereupon the unpaid principal of and accrued interest on such
Note shall become immediately due and payable, and shall thereafter bear
interest at the Default Rate and calculated in accordance with Section 2.2.
Lender may exercise all rights and remedies with respect to the Collateral
granted pursuant hereto for such Note(s), or otherwise available to it under
applicable law, including the right to release, hold or otherwise dispose of all
or any part of the Collateral and the right to utilize, process and commingle
the Collateral.

     Upon the happening and during the continuance of any Event of Default,
Lender may then, or at any time thereafter and from time to time, apply,
collect, sell in one or more sales,

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                                     -15-

<PAGE>

lease or otherwise dispose of, any or all of the Collateral, in its then
condition or following any commercially reasonably preparation or processing, in
such order as Lender may elect, and any such sale may be made either at public
or private sale at its place of business or elsewhere. Borrower agrees that any
such public or private sale may occur upon five (5) calendar day's notice to
Borrower. Lender may require Borrower to assemble the Collateral and make it
available to Lender at a place designated by Lender which is reasonably
convenient to Lender and Borrower. The proceeds of any sale, disposition or
other realization upon all or any part of the collateral shall be distributed by
Lender in the following order of priorities:

     First, to Lender in an amount sufficient to pay in full Lender's reasonable
     costs and professionals' and advisors' fees and expenses;

     Second, to Lender in an amount equal to the then unpaid amount of the
     Secured Obligations in such order and priority as Lender may choose in its
     sole discretion; and

     Finally, upon payment in full of all of the Secured Obligations, to
     Borrower or its representatives or as a court of competent jurisdiction may
     direct.

The Lender shall return to the Borrower any surplus Collateral remaining after
payment of all Secured Obligations.

SECTION 11. MISCELLANEOUS

     11.1   Borrower shall remain liable to Lender for any unpaid Secured
Obligations, advances, costs, charges and expenses, together with interest
thereon and shall pay the same immediately to Lender at Lender's offices.

     11.2   The powers conferred upon Lender by this Agreement are solely to
protect its interest in the Collateral and shall not impose any duty upon Lender
to exercise any such powers.

     11.3   This is a continuing Agreement and the grant of a security interest
hereunder shall remain in full force and effect and all the rights, powers and
remedies of Lender hereunder shall continue to exist until the Secured
Obligations are paid in full as the same become due and payable. When Borrower
has paid in full all Secured Obligations, Lender will, promptly but in no event
later than ten (10) days, upon request of Borrower, execute a written
termination Statement, reassigning to Borrower, without recourse, the Collateral
and all rights conveyed hereby and return possession (if Lender has possession)
of the Collateral to Borrower. The rights, powers and remedies of Lender
hereunder shall be in addition to all rights, powers and remedies given by
statute or rule of law and are cumulative. The exercise of any one or more of
the rights, powers and remedies provided herein shall not be construed as a
waiver of any other rights, powers and remedies of Lender. Furthermore,
regardless of whether or not the UCC is in effect in the jurisdiction where such
rights, powers and remedies are asserted, Lender shall have the rights, powers
and remedies of a secured party under the UCC.

     11.4   Upon payment in full of all Secured Obligations, the Lender shall
cancel the Note(s), this Agreement and all UCC financing statements, if any, and
shall promptly deliver all such canceled documents to the Borrower.

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                                     -16-
<PAGE>

          11.5 GOVERNING LAW. This Agreement, the Note(s) and the other Loan
Documents have been negotiated and delivered to Lender in the State of Illinois
and shall not become effective until accepted by Lender in the State of
Illinois. Payment to Lender by Borrower of the Secured Obligations is due in the
State of Illinois. This Agreement shall be governed by, and construed and
enforced in accordance with the laws of the State of Illinois excluding conflict
of laws principles that would cause the application of laws of any other
jurisdiction.

          11.6 CONSENT TO JURISDICTION AND VENUE. All judicial proceedings
arising in or under or related to this Agreement, the Note or any of the other
Loan Documents may be brought in any state or federal court of competent
jurisdiction located in the State of Illinois. By execution and delivery of this
Agreement, each party hereto generally and unconditionally: (a) consents to
personal jurisdiction in Cook County, State of Illinois; (b) waives any
objection as to jurisdiction or venue in the aforesaid courts; and (d)
irrevocably agrees to be bound by any judgment rendered thereby in connection
with this Agreement, the Note(s) and the other Loan Documents. Service of
process on any party hereto in any action arising out of or relating to this
Agreement shall be effective if given in accordance with the requirements for
notice set forth in Section 11.8 below and shall be deemed effective and
received as set forth in Section 11.8 below. Nothing herein shall affect the
right to serve process in any other manner permitted by law or shall limit the
right of either party to bring proceedings in the courts of any other
jurisdiction.

          11.7 Whenever possible, each provision of this Agreement shall be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this Agreement shall be prohibited by or invalid under
such law, such provision shall be ineffective only to the extent and duration of
such prohibition or invalidity, without invalidating the remainder of such
provision or the remaining provisions of this Agreement.

          11.8 Except as otherwise provided herein, all notices and service of
process required, contemplated, or permitted to have been validly served, or
hereunder shall be in writing and shall be deemed given or delivered upon the
earlier of: (i) the first business day after transmission by facsimile or hand
delivery or deposit with an overnight express service or overnight mail delivery
service; or (ii) or three (3) calendar days after mailed, postage prepaid, in
each case, and shall be addressed to the designated recipient, as follows:

          (a)  If to Lender:
               ------------

                                COMDISCO, INC.
                               Legal Department
                          Attention: General Counsel
                             6111 North River Road
                           Rosemont, Illinois 60018
                            Facsimile: 847.518.5088
                          Telephone: 847.518.698.3000

               With Copys to:
               -------------

                                COMDISCO, INC.
                         Attention: Comdisco Ventures
                             6111 North River Road
                           Rosemont, Illinois 60018

Blanket Loan and Security Agr.

                                      -17-
<PAGE>

                            Facsimile: 847.518.5465
                          Telephone: 847.518.698.3000
                                      and

                               Comdisco Ventures
                            Attention: Glen Howard
                   3000 Sand Hill Road, Bldg. 1, Suite 155
                            Menlo Park, CA 94025
                            Facsimile: 650.854.4026
                            Telephone: 650.854.9484

         (b)   If to Borrower:
               --------------

                    ALIGN TECHNOLOGY INC. 442 Potrero Avenue
                              Sunnyvale, CA 94086
                         Attention:__________________
                           Facsimile: (408) 738-7150
                           Telephone (408) 738-1500

               With a Copy to:
               --------------

                         ____________________________
                         ____________________________
                         ____________________________
                         Attention:__________________
                         Facsimile:__________________
                         Telephone:__________________

or to such other address as each party may designate for itself by like notice.

          11.9      Lender and Borrower acknowledge that there are no agreements
or understandings, written or oral, between Lender and Borrower with respect to
the Loan, other than as set forth herein, in the Note(s) and the other Loan
Documents and that this Agreement, the Note(s) and the other Loan Documents
contain the entire agreement between Lender and Borrower with respect thereto.
None of the terms of this Agreement, the Note(s) and the other Loan Documents
may be amended except by an instrument executed by each of the parties hereto.

          11.10     No omission, or delay, by Lender at any time to enforce any
right or remedy reserved to it, or to require performance of any of the terms,
covenants or provisions hereof by Borrower at any time designated, shall be a
waiver of any such right or remedy to which Lender is entitled, nor shall it in
any way affect the right of Lender to enforce such provisions thereafter.

          11.11     All agreements, representations and warranties contained in
this Agreement or the Note, or in any Loan Documents delivered pursuant hereto
or in connection herewith shall be for the benefit of Lender and any Assignee
and shall survive the execution and delivery of this Agreement or the Note and
the expiration or other termination of this Agreement or the Note.

Blanket Loan and Security Agr.

                                      -18-
<PAGE>

          11.12  This Agreement may be executed in any number of counterparts,
each of which shall be deemed an original, but all such counterparts together
shall constitute but one and the same instrument.

          11.13  CONFIDENTIALITY. Lender acknowledges that certain items of
Collateral, including, but not limited to trade secrets, source codes, customer
lists and certain other items of intellectual Property, and any Financial
Statements provided pursuant to Section 6 hereof, constitute proprietary and
confidential information of the Borrower (the "Confidential Information").
Accordingly, lender agrees that any Confidential Information it may obtain in
the course of acquiring, perfecting or foreclosing on the Collateral or
otherwise provided under this Agreement, provided such Confidential Information
is marked as confidential by Borrower at the time of disclosure or is oral
information which is confirmed in writing and marked as confidential with thirty
(30) days following disclosure, shall be received in the strictest confidence
and will not be disclosed to any other person or entity in any manner
whatsoever, in whole or in part, without the prior written consent of the
Borrower, unless and until Lender has acquired indefeasible title thereto.

          11.14  This Agreement shall be binding upon, and shall inure to the
benefit of, Borrower and its permitted assigns (if any). Borrower shall not
assign its obligations under this Agreement, the Note(s) or any of the other
Loan Documents without Lender's express written consent and any such attempted
assignment shall be void and of no effect. Any assignment by Borrower in
connection with a "Merger" (as defined below) shall be subject to Lender's prior
consent. Any consent granted by Lender shall be conditioned upon such surviving
entity or transferee assuming Borrower's Secured Obligations hereunder pursuant
to assignment documents reasonably acceptable to Lender. If Lender reasonably
withholds its consent to such assignment in connection with a Merger, the
outstanding principal and accrued and unpaid interest shall be prepaid in whole
in accordance with Section 2.6 hereof.

          For purposes of this Agreement, a "Merger" shall mean any
consolidation or merger of the Borrower with or into any other corporation or
entity, any sale or conveyance of an or substantially all of the assets or stock
of the Borrower by or to any other person or entity in which Borrower is not the
surviving entity.

          IN WITNESS WHEREOF, the Borrower and the Lender have duly executed and
delivered this Agreement as of the day and year first above written.

                              BORROWER: ALIGN TECHNOLOGY INC.

                                   By:    /s/ Muhammed Ziaullah K. Chishti
                                          ------------------------------------
                                   Title:         CEO
                                          ------------------------------------
                                   Date:          4/16/99
                                          ------------------------------------

Blanket Loan and Security Agr.

                                      -19-
<PAGE>

ACCEPTED IN ROSEMONT, ILLINOIS:
------------------------------

                    LENDER:   COMDISCO, INC.

                         By:    ____________________________

                         Title: ____________________________

                         Date:  ____________________________

                                     -20-
<PAGE>

                                   EXHIBIT A
                            SECURED PROMISSORY NOTE

     $_______________                           Date:________________

                                                Due: ________________

FOR VALUE RECEIVED, Align Technology Incorporated a Delaware corporation (the
"Borrower") hereby promises to pay to the order of Comdisco, Inc., a Delaware
corporation (the "Lender") at P.O. Box 91744, Chicago, IL 60693 or such other
place of payment as the holder of this Secured Promissory Note (this "Note") may
specify from time to time in writing, in lawful money of the United States of
America, the principal amount of ___________ and 00/l00 Dollars ($___________)
together with interest at twelve percent (12.0%) per annum from the date of this
Note to maturity of each installment on the principal hereof remaining from time
to time unpaid, such principal and interest to be paid in 36 equal monthly
installments of $___________ each, commencing ____________ and on the same day
of each month thereafter to and including ___________, such installments to be
applied first to accrued and unpaid interest and the balance to unpaid
principal. Interest shall be computed on the basis of a year consisting of
twelve months of thirty days each.

This Note is the Note referred to in, and is executed and delivered in
connection with, that certain Loan and Security Agreement of dated as of April
12 1999 herewith by and between Borrower and Lender (as the same may from time
to time be amended, modified or supplemented in accordance with its terms, the
"Loan Agreement"), and is entitled to the benefit and security of the Loan
Agreement and the other Loan Documents (as defined in the Loan Agreement), to
which reference is made for a statement of all of the terms and conditions
thereof. All terms defined in the Loan Agreement shall have the same definitions
when used herein, unless otherwise defined herein.

The Borrower waives presentment and demand for payment, notice of dishonor,
protest and notice of protest and any other notice as permitted under the UCC or
any applicable law.

This Note has been delivered to Lender and is payable in the State of Illinois,
and shall not become effective until accepted by Lender in the State of
Illinois. This Note shall be governed by and construed and enforced in
accordance with, the laws of the State of Illinois, excluding any conflicts of
law rules or principles that would cause the application of the laws of any
other jurisdiction.

          BORROWER:             ALIGN TECHNOLOGY INC.
                                442 Potrero Ave.
                                Sunnyvale, CA 94086

                                Signature:  ____________________________

                                Print Name: ____________________________

                                Title:      ____________________________

<PAGE>

                                   EXHIBIT B
                                ADVANCE REQUEST

                                                         Date: _________________

To Lender:     Comdisco, Inc.
               % Comdisco Ventures
               3000 Sand Hill Road
               Menlo Park, CA 94025
               Attention: Vika Tonga
               Facsimile (650) 854-4026

Borrower hereby requests from Comdisco, Inc. ("Lender") an Advance in the amount
of $_______________ under that Loan and Security Agreement between Borrower and
Lender dated April 12, 1999 (the "Agreement").

     Please:
     ------

     (a)       Issue a check payable to Borrower      ____________

                                      or

     (b)       Wire Funds to Borrower's account       ____________

               Bank:               ______________________________________
               Address:            ______________________________________
                                   ______________________________________
               ABA Number:         ______________________________________
               Account Number:     ______________________________________
               Account Name:       ______________________________________

Borrower hereby affirms that all Representations and Warranties of Borrower set
forth in Section 4 and all Conditions Precedent to Loan set forth in Section 7
of the Agreement remain true and correct in all material respects as of the date
hereof.

     Executed this ____ day of __________, 1999 by:

                    BORROWER:     ALIGN TECHNOLOGY INC.

                         BY:      ________________________

                         TITLE:   ________________________

                         PRINT:   ________________________

Blanket Loan and Security Agr.
                                     -21-

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