How much carbamide peroxide teeth whitener is placed into the bleaching tray?
Current thought is that teeth whitening with carbamide peroxide involves thin-film chemistry. This simply means that the process does not require a large amount of whitener but just enough to cover the front surface of the teeth being whitened. Placing an excess of whitener into the bleaching tray will cause the gel to express out as the tray is being seated, and as a result whitener will be wasted. Additionally, and especially in the case of the use of stock bleaching trays, the whitener that is expressed from the tray will be held in contact with the user’s gums. This can make the likelihood of experiencing side effects greater.
