Bleach/hydrogen peroxide in toothwhiteners
Toothwhitening products will either whiten teeth through abrasion, where tiny, rough particles help to rub off discoloration, or by using a bleaching agent such as hydrogen peroxide.
Where bleaching agents are used, the level is restricted to 0.1% under European cosmetics legislation.
In the past some toothwhitening products have appeared on the UK market containing higher quantities of peroxide. These are illegal so it is advisable to purchase your product from a reputable retailer or your dentist.