Document:

EX-10.5

[LETTERHEAD OF RODMAN & RENSHAW, LLC]

June 23, 2011

STRICTLY CONFIDENTIAL

Federico Pignatelli

Chairman and Chief Executive Officer

BIOLASE Technology, Inc.

4 Cromwell

Irvine, CA 92618

Dear Mr. Pignatelli:

Reference is made to that certain letter agreement (“Letter Agreement”), dated June
22, 2011, by and between BIOLASE Technology (the “Company”) and Rodman & Renshaw, LLC
(“Rodman”) pursuant to which Rodman shall serve as the exclusive lead placement agent (the
“Services”) for the Company, on a reasonable best efforts basis, in connection with the
proposed offer and placement (the “Offering”) by the Company of securities of the Company (the
“Securities”). The Company and Rodman hereby agree to amend the Letter Agreement by deleting
Section A.2 in its entirety and any and all references to Rodman Warrants in the Letter Agreement
shall be disregarded.

The Company represents that it is free to enter into this Agreement and the transactions
contemplated hereby. This Agreement shall not be modified or amended except in writing signed by
Rodman and the Company. This Agreement shall be binding upon and inure to the benefit of Rodman
and the Company and their respective assigns, successors, and legal representatives. This
Agreement constitutes the entire agreement of Rodman and the Company, and supersedes any prior
agreements, with respect to the subject matter hereof. If any provision of this Agreement is
determined to be invalid or unenforceable in any respect, such determination will not affect such
provision in any other respect, and the remainder of the Agreement shall remain in full force and
effect. This Agreement may be executed in counterparts (including facsimile or .pdf counterparts),
each of which shall be deemed an original but all of which together shall constitute one and the
same instrument.

Notwithstanding any of the foregoing, all other provisions of the Letter Agreement and all
rights and obligations thereunder between Rodman and the Company, shall remain the same as of the
date of execution of the Letter Agreement.

In acknowledgment that the foregoing correctly sets forth the understanding reached by Rodman
and the Company, please sign in the space provided below, whereupon this letter shall constitute a
binding agreement as of the date indicated above.

[signature page follows]

Very truly yours,

RODMAN & RENSHAW, LLC

By /s/ John Borer

John Borer

Head of Investment Banking

Accepted and Agreed:

BIOLASE TECHNOLOGY, INC

By /s/ Federico Pignatelli

Federico Pignatelli

Chief Executive Officer

[Signature page to BLTI Amendment to Letter Agreement]Exhibit 10.42

Exhibit 10.42

PROMISSORY NOTE

$100,000                                                                                                                                                  June 23, 2010

FOR VALUE RECEIVED, the undersigned (herein "Maker"), promises to pay to the order of Joseph W. Abrams (“Payee”), the principal sum of One Hundred Thousand Dollars ($100,000) one (1) year from the date hereof (the "Maturity Date"), unless Payee consents to an extension of the Maturity Date, in lawful money of the United States of America unless Payee agrees to another form of payment. The unpaid principal amount shall bear interest at the rate of eight percent (8%) per annum, which shall be payable on the one-year anniversary of the date hereof (or until the earlier date of payment if this Note is prepaid).

1.

If the Maker shall make a general assignment for the benefit of creditors, or shall admit in writing its inability to pay its debts as they become due, or shall file a petition in bankruptcy, or shall be adjudicated a bankrupt or insolvent, then, and upon the happening of any such event, the Payee at its option, may declare the entire unpaid balance of the principal hereunder immediately due and payable with interest thereon as herein provided. 

2.

Presentment, demand, protest or notice of any kind are hereby waived by the Maker.  Maker may not set off against any amounts due to Payee hereunder any claims against Payee or other amounts owed by Payee to Maker.

3.

In the case any one or more of the events of default specified in paragraph 1 above shall have happened and be continuing, the Payee may proceed to protect and enforce its rights either by suit in equity and/or by action at law, or by other appropriate proceedings.

4.

The Maker agrees to pay all reasonable costs of collection, including attorneys’ fees which may be incurred in the collection of this Note or any portion thereof and, in case an action is instituted for such purposes, the amount of all attorneys' fees shall be such amount as the court shall adjudge reasonable.

5.

This Note is made and delivered in, and shall be governed, construed and enforced under the laws of the State of California.

6.

No delay or omission of the Payee to exercise any right hereunder, whether before or after the happening of any event of default, shall impair any such right or shall operate as a waiver thereof or of any event of default hereunder nor shall any single or partial exercise thereof preclude any other or further exercise thereof, or the exercise of any other right.

7.

This Note shall be subject to prepayment, at the option of the Maker, in whole or in part, at any time and from time to time, without premium or penalty.

8.

This Note or any benefits or obligations hereunder may not be assigned or transferred by the Maker.

MAKER:

PROPELL CORPORATION

By: s/Edward Bernstein                 

Edward Bernstein, CEO

Acknowledged and agreed to by PAYEE:

By: /s/Joseph Abrams                 

Joseph W. Abrams

Date:Exhibit 10.43

Exhibit 10.43

PROMISSORY NOTE

$100,000                                                                                                                                                  December 15, 2010

FOR VALUE RECEIVED, the undersigned (herein "Maker"), promises to pay to the order of Joseph W. Abrams (“Payee”), the principal sum of One Hundred Thousand Dollars ($100,000) one (1) year from the date hereof (the "Maturity Date"), unless Payee consents to an extension of the Maturity Date, in lawful money of the United States of America unless Payee agrees to another form of payment. The unpaid principal amount shall bear interest at the rate of ten percent (10%) per annum, which shall be payable on the one-year anniversary of the date hereof (or until the earlier date of payment if this Note is prepaid).

9.

If the Maker shall make a general assignment for the benefit of creditors, or shall admit in writing its inability to pay its debts as they become due, or shall file a petition in bankruptcy, or shall be adjudicated a bankrupt or insolvent, then, and upon the happening of any such event, the Payee at its option, may declare the entire unpaid balance of the principal hereunder immediately due and payable with interest thereon as herein provided. 

10.

Presentment, demand, protest or notice of any kind are hereby waived by the Maker.  Maker may not set off against any amounts due to Payee hereunder any claims against Payee or other amounts owed by Payee to Maker.

11.

In the case any one or more of the events of default specified in paragraph 1 above shall have happened and be continuing, the Payee may proceed to protect and enforce its rights either by suit in equity and/or by action at law, or by other appropriate proceedings.

12.

The Maker agrees to pay all reasonable costs of collection, including attorneys’ fees which may be incurred in the collection of this Note or any portion thereof and, in case an action is instituted for such purposes, the amount of all attorneys' fees shall be such amount as the court shall adjudge reasonable.

13.

This Note is made and delivered in, and shall be governed, construed and enforced under the laws of the State of California.

14.

No delay or omission of the Payee to exercise any right hereunder, whether before or after the happening of any event of default, shall impair any such right or shall operate as a waiver thereof or of any event of default hereunder nor shall any single or partial exercise thereof preclude any other or further exercise thereof, or the exercise of any other right.

15.

This Note shall be subject to prepayment, at the option of the Maker, in whole or in part, at any time and from time to time, without premium or penalty.

16.

This Note or any benefits or obligations hereunder may not be assigned or transferred by the Maker.

MAKER:

PROPELL CORPORATION

By: s/Edward Bernstein                 

Edward Bernstein, CEO

Acknowledged and agreed to by PAYEE:

By: /s/Joseph Abrams                 

Joseph W. Abrams

Date:Exhibit 10.44

Exhibit 10.44

PROMISSORY NOTE

$100,000                                                                                                                                                  February 15, 2011

FOR VALUE RECEIVED, the undersigned (herein "Maker"), promises to pay to the order of Joseph W. Abrams (“Payee”), the principal sum of One Hundred Thousand Dollars ($100,000) one (1) year from the date hereof (the "Maturity Date"), unless Payee consents to an extension of the Maturity Date, in lawful money of the United States of America unless Payee agrees to another form of payment. The unpaid principal amount shall bear interest at the rate of twelve percent (12%) per annum, which shall be payable on the one-year anniversary of the date hereof (or until the earlier date of payment if this Note is prepaid).

17.

If the Maker shall make a general assignment for the benefit of creditors, or shall admit in writing its inability to pay its debts as they become due, or shall file a petition in bankruptcy, or shall be adjudicated a bankrupt or insolvent, then, and upon the happening of any such event, the Payee at its option, may declare the entire unpaid balance of the principal hereunder immediately due and payable with interest thereon as herein provided. 

18.

Presentment, demand, protest or notice of any kind are hereby waived by the Maker.  Maker may not set off against any amounts due to Payee hereunder any claims against Payee or other amounts owed by Payee to Maker.

19.

In the case any one or more of the events of default specified in paragraph 1 above shall have happened and be continuing, the Payee may proceed to protect and enforce its rights either by suit in equity and/or by action at law, or by other appropriate proceedings.

20.

The Maker agrees to pay all reasonable costs of collection, including attorneys’ fees which may be incurred in the collection of this Note or any portion thereof and, in case an action is instituted for such purposes, the amount of all attorneys' fees shall be such amount as the court shall adjudge reasonable.

21.

This Note is made and delivered in, and shall be governed, construed and enforced under the laws of the State of California.

22.

No delay or omission of the Payee to exercise any right hereunder, whether before or after the happening of any event of default, shall impair any such right or shall operate as a waiver thereof or of any event of default hereunder nor shall any single or partial exercise thereof preclude any other or further exercise thereof, or the exercise of any other right.

23.

This Note shall be subject to prepayment, at the option of the Maker, in whole or in part, at any time and from time to time, without premium or penalty.

24.

This Note or any benefits or obligations hereunder may not be assigned or transferred by the Maker.

MAKER:

PROPELL CORPORATION

By: s/Edward Bernstein                 

Edward Bernstein, CEO

Acknowledged and agreed to by PAYEE:

By: /s/Joseph Abrams                 

Joseph W. Abrams

Date:

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