Single phase whitening dentifrice

Abstract

The invention provides a single phase whitening dentifrice that includes (i) a whitening agent selected from the group consisting of hydrogen peroxide, a bound peroxide and a solid peroxide (ii) an abrasive and (iii) a substantially anhydrous orally acceptable carrier, for example, polyethylene glycol. The bound peroxide may be hydrogen peroxide and a polymer and/or any peroxide compound and a porous cross-linked polymer, such as polymers of polyvinyl pyrrolidone, polyacrylates, a polymethacrylates, and a polyitaconates. The solid peroxide may be sodium perborate or urea peroxide. The invention also provides methods of whitening the tooth surfaces by contacting the surface with the composition.

1 . A single phase whitening dentifrice comprising: 
 a whitening agent selected from the group consisting of hydrogen peroxide, a bound peroxide and a solid peroxide;    an abrasive; and    a substantially anhydrous orally acceptable carrier.    
   
   
       2 . The composition according to  claim 1 , wherein the whitening agent is not sodium percarbonate.  
   
   
       3 . The composition according to  claim 1 , wherein the bound peroxide comprises hydrogen peroxide and a polymer.  
   
   
       4 . The composition according to  claim 1 , wherein the bound peroxide comprises a peroxide compound and a cross-linked polymer.  
   
   
       5 . The composition according to  claim 4 , wherein the monomer is selected from the group consisting of a polyvinyl pyrrolidone, polyacrylate, a polymethacrylate, and polyitaconates.  
   
   
       6 . The composition according to  claim 1 , wherein the solid peroxide is selected from the group consisting of sodium perborate and urea peroxide.  
   
   
       7 . The composition according to  claim 1 , comprising about 0.1% to about 30% of the whitening agent.  
   
   
       8 . The composition according to  claim 1 , wherein the water content of the composition is less than about 10%.  
   
   
       9 . The composition according to  claim 1 , wherein the substantially anhydrous carrier comprises polymers and copolymers of polyethylene glycol, of ethylene oxide and of propylene oxide.  
   
   
       10 . The composition according to  claim 1 , wherein the substantially anhydrous carrier further comprises a surfactant, a silicone fluid, a fumed silica, a high molecular weight PEG, a carbomer, a gum and a synthetic gum.  
   
   
       11 . The composition according to  claim 1 , further comprising a surfactant.  
   
   
       12 . The composition according to  claim 11 , wherein the surfactant is anionic.  
   
   
       13 . The composition according to  claim 11 , wherein the surfactant is sodium lauryl sulfate.  
   
   
       14 . The composition according to  claim 1 , further comprising a fluoride salt.  
   
   
       15 . The composition according to  claim 16 , further comprising a peroxide incompatible silica abrasive.  
   
   
       16 . The composition according to  claim 16 , further comprising a surfactant.  
   
   
       16 . A single phase whitening oral care composition, comprising: 
 a. a substantially anhydrous agent selected from the a N-vinyl heterocyclic polymer cross-linked with hydrogen peroxide, a cross-linked polymer comprising a peroxide, and a solid peroxide;    b. an anticalculus agent; and    c. a substantially anhydrous carrier.    
   
   
       17 . The composition according to  claim 16 , additionally comprising a fluoride salt.  
   
   
       18 . The composition according to  claim 16 , further comprising an active agent selected from an antimicrobial agent, an anti-inflammatory agent, a zinc salt, a stannous salt, and triclosan.  
   
   
       19 . The composition according to  claim 16 , wherein the abrasive is selected from calcium pyrophosphate and dicalcium phosphate.  
   
   
       20 . A method of whitening a tooth surface, the method comprising contacting the tooth surface with a single phase whitening dentifrice comprising a whitening agent selected from the group consisting of a bound peroxide and a solid peroxide; an abrasive; and a substantially anhydrous orally acceptable carrier.