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A white, bright smile is an important accessory for any face. Teeth bleaching uses either hydrogen peroxide or carbamide peroxide to break down stains and make teeth whiter. While most toothpastes include particles of silica or aluminum oxide to grind away surface stains, these ingredients can't clear up long-term, persistent staining.

Most bleaching procedures - whether self-administered at home or performed by a dentist - contain about 10% hydrogen peroxide or a higher concentration (about 20%) of its slightly weaker derivative, carbamide peroxide, an oxidizing agent which breaks up the stain-causing molecules on the teeth.