The delivery trays are pre-loaded with a membrane-like inner tray coated with a 10 percent hydrogen peroxide whitener containing the same sensitivity-reducing mix of potassium nitrate and fluoride as is found in Opalescence systems with custom-made trays. The wear time for Trèswhite is 30 to 60 minutes, once a day. Packs of Trèswhite Supreme (10 uppers and 10 lowers), for use over the course of five to 10 days, are available in mint, peach and melon flavors.
Coated with a whitening gel, these thin, flexible membranes are designed to conform to the shape of the teeth. They are very convenient and easy to use no mixing or molding is required.
What's more, they are unobtrusive enough to be worn on the job or while commuting or shopping.
However, whitening strips are less effective than trays for removing between-the-teeth stains and are not suitable for crooked teeth.
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