Patent ID: 7833539

Claim:
A method of whitening teeth, said method comprising the steps of: applying a bioadhesive material to the gums; applying a tooth whitening hydrogel composition to a surface of the teeth wherein the tooth whitening composition includes: a peroxide compound in the range of about 1% to about 30% by weight; a mixed metal chelating system in an amount in the range of about 0.1% to about 8% by weight, wherein the metal chelating system includes a condensed pyrophosphate, an organic phosphate chelating agent, and a metal precipitating agent; a catalase inhibitor; and with a proviso that the tooth whitening composition does not contain a hydrocarbon humectant; contacting the tooth whitening hydrogel composition on the surface of the teeth with a flexible film, wherein the flexible film does not react with the bioadhesive material and does not react with the peroxide compound; and molding the flexible film to cover the surfaces of the teeth to prevent contact between the tooth whitening composition and soft tissues of the mouth.