Process and composition for high efficacy teeth whitening

A composition for whitening teeth comprising:

• a first component in the form of a suspension or solution, said first component having a pH of about 3.0 to 7.5 and comprising about 15% to 34% carbamide peroxide, up to about 50% water, and at least one stabilizer, selected from the group consisting of sodium silicate, 8-hydroxyquinoline, sodium stannate, oxalic-bis (cyclohexylidenehydrazide), amino-trismethylene-phosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, sodium pyrophosphate, and 1-hydroxyethylidene-1,1-phosphonic acid, said first component being colorless;
• and
• a second component in the form of an aqueous gel or paste, said second component having a pH of about 8.0 to 12 and comprising one or more alkali materials selected from the group consisting of oxides of metals belonging to the first or second group of the Periodic Table, hydroxides of metals belonging to the first or second group of the Periodic Table, and sodium, potassium, calcium, or magnesium salts of weak acids, and a colored dye indicator which gradually discolors or loses color when reacted with a radical oxygen;
• wherein admixing of said first and second components prior to applying the composition to teeth provides the composition for whitening teeth having a pH of about 8.0 to 12.

A process for whitening teeth, comprising:

• mixing first and second components to form a tooth whitening composition,
• the first component comprising about 15% to 34% carbamide perioxide and up to 50% water,and at least one stabilizer selected from the group consisting of sodium silicate, 8-hydroxyquinoline, sodium stannate, oxalic-bis (cyclohexylidenehydrazide), amino-trismethylene-phosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, sodium pyrophosphate, and 1-hydroxyethylidene-1,1,-phosphonic acid, said first component having a pH of about 3.0 to 7.5;
• and
• the second component comprising one or more alkali materials selected from the group consisting of calcium oxide, sodium hydroxide, potassium hydroxide, potassium bicarbonate, sodium acetate, sodium carbonate, sodium bicarbonate, sodium benzoate, sodium acrylate, sodium methacrylate, sodium gluconate, calcium carbonate, magnesium carbonate, calcium phosphates, calcium bicarbonate, calcium gluconate, and calcium silicate, said second component having a pH of about 8.0 to 10;
• and
• contacting one or more teeth with the tooth whitening composition for about 10-60 minutes or less.

A composition for whitening teeth comprising:

• a first component in the form of a suspension or solution comprising about 5% to 34% carbamide peroxide and up to 50% water, and at least one stabilizer selected from the group consisting of sodium silicate, 8-hydroxyquinoline, sodium stannate, oxalic-bis (cyclohexylidenehydrazide), amino-trismethylene-phosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, sodium pyrophosphate, and 1-hydroxyethylidene-1,1-phosphonic acid, said first component having a pH of about 3.0 to 7.5;
• and
• a second component in the form of an aqueous gel or paste comprising one or more alkali materials selected from the group consisting of sodium, potassium, magnesium, and calcium salts of weak acids, oxides of sodium, potassium, magnesium, and calcium;
• and hydroxides of sodium, potassium, magnesium, and calcium;
• said second component having a pH about 8.0;
• wherein admixing of said first and second components prior to applying the composition to the teeth provides the composition for whitening teeth having a pH of about 8.0 to 12.

A composition for whitening teeth comprising:

• a first component in the form of a suspension or solution, said first component having a pH of about 3.0 to 7.5 and comprising about 15% to 34% carbamide peroxide, up to about 50% water, and at least one stabilizer selected from the group consisting of sodium silicate, 8-hydroxyquinoline, sodium stannate, oxalic-bis (cyclohexylidenehydrazide), amino-trismethylene-phosphonic acid, 2-phosphonobutane-1,2,4-tricarboxylic acid, sodium pyrophosphate, and 1-hydroxyethylidene-1,1-phosphonic acid, said first component being colorless;
• and
• a second component in the form of an aqueous gel or paste, said second component having a pH above 8.0 and comprising a colored dye indicator which gradually discolors or loses color when reacted with a radical oxygen, and one or more alkali materials selected from the group consisting of sodium, potassium, magnesium, and calcium salts of weak acids, oxides of sodium, potassium, magnesium, and calcium, and hydroxides of sodium, potassium, magnesium, and calcium;
• wherein admixing of said first and second components prior to applying the compositon to teeth provides the composition for whitening teeth having a pH of about 8.0 to 12.