545 Rue de Saint Jovite,
J8E 2Z9, Canada
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545 Rue de Saint Jovite, CP 4510
J8E 1A1, Canada
Various chemical and physical agents can be used to whiten teeth. Toothpaste typically has small particles of silica, aluminum oxide, calcium carbonate, or calcium phosphate to grind off stains formed by colored molecules that have adsorbed onto the teeth from food. Unlike bleaches, whitening toothpaste does not alter the intrinsic color of teeth.
Bleaching solutions contain peroxide, which bleaches the tooth enamel to change its color. Off-the-shelf products typically rely on a carbamide peroxide solution varying in concentration from 10% to 44%. Bleaching solutions may be applied directly to the teeth, embedded in a plastic strip that is placed on the teeth or use a gel held in place by a mouthguard.
The US FDA only approves gels that are under 6% hydrogen peroxide or 16% or under of carbamide peroxide. The Scientific Committee for Consumer Protection of the EU also consider gels containing higher concentrations than mentioned above to be unsafe.