Abstract:
An oral care strip includes a substrate having a first side and a second side. An oral care substance is disposed on the first side and a flavor element is attached to the second side. The flavor element may be a dissolvable, edible, flavored film. A method for forming the oral care strip includes the steps of a) applying an oral care substance to a first side of a substrate and b) attaching a flavor element to a second side of the substrate. The second side of the substrate may include a wax layer to which the flavor element is attached.

Description:
BACKGROUND OF THE INVENTION 
       [0001]    The present invention relates generally to oral care strips, and more particularly to a flavored oral care strip and a method of making the same. 
         [0002]    Oral care strips have recently grown in popularity as an effective way to deliver an oral care substance, such as a tooth whitening agent, to a tooth or multiple teeth. In one known embodiment, the strip includes a thin fabric substrate having a size sufficient to cover multiple teeth. The substrate has a tooth whitening agent on one side and a wax on the other side. The tooth whitening agent is covered by a releasable carrier, such as a mylar film. In use, the carrier is peeled away by a consumer to expose the whitening agent, and the strip is placed in the consumer&#39;s mouth with the whitening agent in contact with the front surface of the consumer&#39;s teeth. A portion of the strip is folded behind the teeth so the strip can be pinched together about the teeth. The wax layer prevents the strip from sticking to the inside of the mouth, and helps to keep the strip formed about the teeth. The strip is left in the consumer&#39;s mouth a predetermined length of time such that the agent can act to whiten the teeth. 
         [0003]    Unfortunately, while oral care strips provide the benefit of whiter teeth, there are some difficulties in using them, primarily in the lack of comfort and enjoyment. Many of the strips can be uncomfortable to keep in the mouth for a prolonged period, and the whitening gel often has a displeasing taste. In an attempt to overcome these difficulties, some manufacturers have added flavoring agents to the whitening agent; however, when combined, these agents can react with each other and become unstable. In another case, shown in U.S. Pat. No. 6,916,463 to Lee, a flavoring agent is added to the side of the substrate opposite the whitening agent by chemically linking the flavoring agent to a phosphate and then adhering the composition to the substrate with a carrier material. However, manufacturers are continually searching for ways to more effectively overcome these difficulties. 
       SUMMARY OF THE INVENTION 
       [0004]    The aforementioned problems are overcome by the present invention, wherein an oral care strip is provided with a flavor element. 
         [0005]    In one aspect, the oral care strip includes a substrate having a first side and a second side. An oral care substance, such as a tooth whitening agent, is disposed on the first side and covered with a releasable protective carrier. A flavor element is attached to the second side opposite the oral care substance, so that the flavor element is exposed to the interior of a user&#39;s mouth when the oral care substance is placed in contact with the user&#39;s teeth. The flavor element may be a dissolvable, edible, flavored film, such as the breath strips that are known for placement on a user&#39;s tongue to enhance breath odor. In one embodiment, the flavor element may be a plurality of ground-up particles of the dissolvable edible film left over from the production of breath strips. The second side of the substrate may include wax, and the particles may be attached to the surface of the wax. 
         [0006]    In a second aspect, the present invention includes a method for forming a flavored oral care strip. The method includes the steps of a) applying an oral care substance to a first side of a substrate and b) attaching a flavor element to a second side of the substrate. The second side of the substrate may additionally include a molten wax, and the flavor element may be placed onto a surface of the molten wax opposite the substrate, in which case the flavor element is retained in the wax as the wax solidifies. First and second removable carrier films may be placed over the oral care substance and over the flavor element. 
         [0007]    The present invention makes the use of oral care strips more enjoyable by effectively adding flavoring to the strips opposite the oral care substance. In addition, the use of left over particles of dissolvable film is cost effective. Thirdly, the method of applying the particles to a molten wax enables the addition of flavoring without a significant loss of manufacturing time. 
         [0008]    These and other objects, advantages, and features of the invention will be readily understood and appreciated by reference to the detailed description of the current embodiment and the drawings. 
     
    
     
       BRIEF DESCRIPTION OF THE DRAWINGS 
         [0009]      FIG. 1  is a schematic view of one embodiment of the method of manufacturing the present invention. 
           [0010]      FIG. 2  is a top view of the oral care strip according to one embodiment. 
           [0011]      FIG. 3  is a cross sectional view thereof along line  3 - 3  in  FIG. 2 . 
           [0012]      FIG. 4  is an exploded view thereof. 
           [0013]      FIG. 5  is a perspective view of the oral care strip as typically received by a consumer. 
           [0014]      FIG. 6  is a perspective view of the oral care strip including both releasable carriers. 
       
    
    
     DETAILED DESCRIPTION OF THE INVENTION 
       [0015]    I. Overview 
         [0016]    An oral care strip according to one embodiment of the present invention is shown in  FIGS. 2-6  and generally designated  10 . As shown in  FIG. 4 , the oral care strip  10  is a thin strip comprised of multiple layers, including a substrate  12 , an oral care substance  14 , a wax layer  16 , a flavor element  18 , a first releasable carrier  20  over the flavor element  18  and a second releasable carrier  22  over the oral care substance  14 . In use, the strip  10  is inserted into a user&#39;s mouth such that the oral care substance  14  contacts at least the front surface of the teeth. A portion of the strip may be folded around the rear surfaces of the teeth to hold the strip on the teeth. The flavor element  18  is exposed to the user&#39;s mouth to add a desired flavor while the strip is in the user&#39;s mouth. 
         [0017]    II. Structure 
         [0018]    The substrate layer  12  is a thin, bendable strip comprised of one of a variety of materials. In one embodiment, the substrate  12  is a non-woven polyester. Alternatively, the substrate may be foam, a woven or non-woven fabric, or any other desired strip material that would not be harmful if placed in a person&#39;s mouth. As shown in  FIG. 2 , the strip  10  and substrate  12  are cut to fit over multiple teeth in a user&#39;s mouth. The strip includes an upper edge  24 , a lower edge  26  and first and second side edges  28  and  30 . The lower edge  26  may define a number of slits  32 . The slits  32  enable the lower edge  26  to be folded easily about the rear surface of a user&#39;s teeth. 
         [0019]    The oral care substance  14  is an agent that whitens or otherwise improves the appearance of teeth. Oral care substances are known in the art, and therefore will not be described in great detail. In one embodiment, the oral care substance is applied to the lower surface  34  of the substrate  12  to form a tooth contacting surface of the strip  10 . The oral care substance  14  may be a homogeneous gel that is uniformly and continuously coated on the lower surface  34  of the substrate  12 . Alternatively, the substance  14  may be a laminate or separated layers of components, an amorphous mixture of components, separate stripes of spots or other patterns of different components, or a combination of these structures. The substance  14  contains an active ingredient that is capable of influencing or effecting a desired change in appearance and/or structure of the surface it contacts. Example active ingredients include: hydrogen peroxide, carbamide peroxide, sodium fluoride, sodium monofluorophosphate, pyrophosphate, chlorhexidine, polyphosphate, triclosan and enzymes. Examples of appearance and structural changes include, but are not limited to, whitening, stain bleaching, stain removal, remineralization to form fluorapatite, plaque removal and tartar removal. 
         [0020]    The wax layer  16  comprised of a wax or wax-like material and is generally applied or attached to the upper surface  36  of the substrate  12 . This layer is located opposite the tooth contacting layer of oral care substance  14  such that it is exposed to the inside of the user&#39;s mouth when the tooth contacting layer contacts the surface of the user&#39;s teeth. The wax layer  16  helps prevent the strip  10  from sticking to the inside of the user&#39;s mouth, and provides a bendable substance that help form the strip  10  to the surface contour of the teeth. As an alternative to wax, the wax layer  16  may be formed from plastic, putty, or another deformable material. 
         [0021]    The flavor element  18  may be one of a variety of known flavorings or flavored substances. In one embodiment, the flavor element  18  is comprised of a plurality of particles of a thin, edible, dissolvable, flavored film. The film may be comprised of a known dissolvable binder, such as pullulan, and a flavor ingredient such as mint, for example, peppermint, spearmint or wintergreen or other flavors such as cinnamon, berry or citrus. As illustrated, the flavor element  18  is disposed on the strip  10  opposite the tooth contacting oral care substance  14 . In the illustrated embodiment, the flavor element  18  is attached to the surface of the wax layer  16 . In an alternative embodiment, the strip  10  may not include a wax layer  16  and the flavor element may be attached directly to the substrate  12  opposite the oral care substance  14 . As described below in more detail, in the illustrated embodiment the particles of film are attached to the wax layer when the wax is in a molten state, such that the particles are at least partially embedded in the wax when the wax has solidified. In one embodiment, the particles are stable at least up to the temperature of the molten wax, such that they do not melt completely when applied to the molten wax. 
         [0022]    The carrier layers  20  and  22  are typically formed from the same thin, bendable material such as mylar or nylon. The first carrier  20  is such that it covers the flavor element  18  and wax layer  16  and may be peeled from the wax layer  16  when the wax is in solid form by a manufacturer or a consumer. The second carrier  22  is such that it covers the oral care substance  14  and may be releasably peeled from the oral care substance  14  by a manufacturer or a consumer.  FIG. 6  shows the strip  10  as portions of the carriers  20  and  22  are peeled away. In one embodiment, shown in  FIG. 5 , the first carrier  20  is peeled away by the manufacturer before packaging, and the second carrier  22  remains on the strip  10  until removed by a consumer. 
         [0023]    III. Manufacture 
         [0024]    One embodiment of the method of manufacturing the present invention is shown schematically in  FIG. 1 .  FIG. 1  schematically shows hoppers and rollers for dispensing the various components, however, various other devices can otherwise be used to hold and dispense the components. As shown, the various layers are added one on top of the other as they are moved by a number of rollers  40 . The bottom or initial layer is the second carrier layer  22 . The flavor element  18 , shown in  FIG. 1  as particles of flavored film, is then released from a hopper  42  onto the carrier  22 . The wax layer  16 , in a softened or molten form, is then extruded from a hopper  44  over the flavor element  18  and the carrier  22 . The substrate  12  is dispensed from a roller  46  and layered on top of the wax  16 , and the oral care substance  14  is dispensed from a hopper  48  onto the upper surface  36  of the substrate  12 . Finally, the first carrier layer  20  is layered from a roller  50  on top of the oral care substance  14 . 
         [0025]    The flavor element  18  attaches to the wax layer as the wax is solidifying. More particularly, when the flavor element  18  is contacted by the softened wax, the flavor element  18  becomes at least partially embedded in the softened wax layer, such that it attaches to the wax layer as the wax  16  cools and solidifies. In an alternative embodiment, wherein the strip  10  does not include a wax layer, the flavor element  18  may be attached directly to the substrate  12  in a similar manner, for instance, the substrate  12  may be comprised of a polymer and the flavor element  18  may be placed on the polymer as it is in a molten form and attach to the polymer as it cures. 
         [0026]    Once all of the layers are dispensed, the resulting layered product can then be cut into the strips  10  of a desired shape. In one embodiment, the second carrier  22  is peeled off the strips  10  by the manufacturer before the strips are packaged, such that the wax layer and flavor element are visible. The first carrier  20  is removed by the consumer just prior to inserting the strip into the mouth to expose the oral care substance  14 . The strip  10  can then be inserted into the user&#39;s mouth such that the oral care substance  14  contacts the user&#39;s teeth, and the exposed flavor element provides flavor to the user&#39;s mouth. In the embodiment wherein the flavor element  18  includes particles of dissolvable, flavored film, the exposed film dissolves in the user&#39;s mouth when wiped with the tongue, lips, or otherwise passing saliva over the strip. In some cases, as portions of the wax are wiped away or removed, additional particles of flavor element  18  are revealed, thus providing longer lasting flavor for the user. 
         [0027]    The above description is that of the current embodiment of the invention. Various alterations and changes can be made without departing from the spirit and broader aspects of the invention as defined in the appended claims, which are to be interpreted in accordance with the principles of patent law including the doctrine of equivalents. Any reference to claim elements in the singular, for example, using the articles “a,” “an,”“the” or “said,” is not to be construed as limiting the element to the singular.