How Tooth Whiteners Work
Tooth whitening systems use peroxide or peroxide-generating compounds as the whitening ingredient. Most are formulated with hydrogen peroxide, carbamide peroxide (also known as urea peroxide). The latter two are most common, and are about three times less potent than hydrogen peroxide itself.
In general, the more peroxide, the greater the whitening power. Formulations differ depending on the way the product is applied either painted on, as a strip or in a tray. Some products are worn for 30 minutes twice a day, while others are worn all night.
Depending on the strength of the whitener, the peroxide acts on the surface of the tooth, as well as the next layer below the dentin. It does not go far enough to reach the pulp (the innermost part of the tooth).
Tooth whiteners will whiten only natural teeth, not caps, crowns, veneers, fillings or dentures. The results are not permanent, but will last for about six months.RELATED LINKS:
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