In general, they are considered safe when used correctly, but there are some precautions to take when using them. Whitening will only work on natural teeth, not caps, crowns, veneers or fillings. Products such as whitening toothpastes and gums contain an abrasive material that removes surface stains but do not actually bleach the teeth.
Gels, strips and paint-on kits contain a bleaching agent – peroxide – which changes the actual colour by penetrating deeper into the teeth. The higher the concentration of peroxide, the stronger the whitening power.
The formulas used by dentists have higher concentrations and are more expensive but they tend to work better than over-the-counter products, but due to their potency, if left on too long or used too frequently the high level of peroxide can cause damage to the integrity of the teeth.
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