Oral compositions

A chewable composition for teeth-whitening, comprising a first and a second region separated by a barrier layer,

• the first region comprising an anhydrous chewing gum base having water content of about 1% or less, an anhydrous fruit acid, carbamide peroxide having water content of about 2% or less, glycerin, and one or more gum additives, wherein the ratio of glycerin:gum base:carbamide peroxide:fruit acid, in percent weight relative to the first region, is about 0.5-5:10-50:1-20:0.5-8, and the one or more gum additives are present in an amount sufficient to reach 100% of the weight of the first region;
• and
• the second region comprising a chewable composition comprising a source of bicarbonate ion, a gum base, and one or more gum additives,
• wherein the source of bicarbonate ion and the gum base, respectively, are present in a ratio of about 5-30:15-50 in percent weight relative to the second region, and the one or more gum additives are present in an amount necessary to reach 100% of the weight of the second region, and wherein the source of bicarbonate ion is sodium bicarbonate and the ratio of fruit acid:carbamide peroxide:sodium bicarbonate, by mass, is about 0.5-1.5:3-7:5-10.

A chewable composition for teeth-whitening, comprising a first and a second region separated by a barrier layer,

• the first region comprising an anhydrous chewing gum base having water content of about 1% or less, an anhydrous fruit acid, carbamide peroxide having water content of about 2% or less, glycerin, precipitated amorphous silica, and one or more gum additives, wherein the ratio of precipitated amorphous silica:glycerin:gum base:carbamide peroxide:fruit acid, in percent weight relative to the first region, is about 0.5-5:0.5-5:10-50:1-20:0.5-8, and the one or more gum additives are present in an amount sufficient to reach 100% of the weight of the first region;
• and
• the second region comprising a chewable composition comprising a source of bicarbonate ion, a gum base, and one or more gum additives,
• wherein the source of bicarbonate ion and the gum base, respectively, are present in a ratio of about 5-30:15-50 in percent weight relative to the second region, and the one or more gum additives are present in an amount necessary to reach 100% of the weight of the second region, and
• wherein the source of bicarbonate ion is sodium bicarbonate and the ratio of fruit acid:carbamide peroxide:sodium bicarbonate, by mass, is about 0.5-5:5-20:10-35.

A method for whitening teeth in a human in need thereof, the method comprising:

• placing in the oral cavity of the human a single chewable composition comprising a first and a second region separated by a barrier layer,
• the first region comprising an anhydrous chewing gum base having water content of about 1% or less, an anhydrous fruit acid, carbamide peroxide having water content of about 2% or less, and one or more gum additives, wherein, the ratio of gum base:carbamide peroxide:fruit acid, in percent weight relative to the composition, is about 10-50:1-20:0.5-8, and the one or more gum additives are present in an amount sufficient to reach 100% of the weight of the composition, and
• the second region comprising a chewable composition comprising a source of bicarbonate ion, a gum base, and one or more gum additives, wherein the source of bicarbonate ion and the gum base, respectively, are present in a ratio of about 5-30:15-50 in percent weight relative to the second region, and the one or more gum additives are present in an amount sufficient to reach 100% of the weight of the second region;
• and
• chewing the composition for about 1 to about 30 minutes;
• wherein the total weight of the composition is about 1 g to about 10 g and the chewing provides about 20 mg to about 400 mg hydrogen peroxide equivalents.