What is Tray Whitening?
When it comes to tooth-whitening, you’ve got two options: in-office-based teeth bleaching, or at-home care. With theTray-based tooth bleaching systems, a mouth guard-like tray is filled with a peroxide-based bleaching gel or paste and placed over the teeth for one to several hours a day for up to four weeks.
Generally, the longer you keep a stronger solution on your teeth, the whiter your teeth become. However, the higher the percentage of peroxide in the whitening solution, the shorter it should be applied to the teeth. Keeping the gel on longer will dehydrate the tooth and increase tooth sensitivity.