Patent ID: 7648363

Claim:
A method for reversibly making teeth look white in the presence of water without chemical bleaching reaction due to a peroxide, said method comprising applying a tape, sheet or film having a gel or paste composition comprising a gelling agent, a tooth whitening component and water coated thereon to teeth for 1 to 120 minutes so that the composition is stuck to teeth and covered by the tape, sheet or film thereby preventing the composition from being diluted by invasion of saliva, said tooth whitening component being one or more selected from the group consisting of lower alcohols having four or less carbon atoms, glycols having ten or less carbon atoms, polyethylene glycols, glycerin, and diglycerin, with the ratio of the tooth whitening component to water being no smaller than 50/49.5, said tooth whitening composition being free of a bleaching agent including a peroxide, wherein when said tape, sheet or film is applied, said tooth whitening component infiltrates into an enamel through its surface and to remain in the enamel, thereby changing optical properties of the enamel without chemical reactions so that the enamel looks apparently cloudy and whiter than original, and after whitening, said one or more tooth whitening components in the enamel is replaced by water from saliva, thereby going back to the original color of the enamel reversibly.