Is it better to get the higher percentage carbamide peroxide or get the lower percentage and wear it longer?
It is not recommended to get he higher percentages (20%-38%) and wear them for more than and hour at a time. However, you can get the lower percentages and wear them for longer periods of time, and even overnight. If you are prone to sensitivity, it is recommended that you get the lower percentage and find a good time period that suits you. There is no study shown that the higher the percentage, the more effective the bleaching is. It has to do more with the wearing time.
