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The procedure itself is painless, but there are a few side effects that may affect some patients. The most common problem is sensitivity of the teeth and gums. This can be controlled with the use of desensitising toothpastes.
If you are bleaching at home, you may be advised to cut down the bleaching time, by having shorter treatment sessions over a longer period of time. In addition, varying the type and strength of the bleaching gel used may be suggested.
Some patients find that wearing the tray makes the teeth tender afterwards when they try to bite things. This can happen because the original impression of the teeth was not made quite accurately enough, and the trays would then probably have to be remade.
Although hydrogen peroxide has been used for many years as a mouth rinse and there appear to be no apparent problems with its use, no-one can say for sure that its use will not cause harm to the teeth or gums that may become apparent years from now.