Most dentists will use any of the following methods: 1. Take home tray whitening, 2. In-office/in-chair whitening or 3. Laser whitening. Any of these methods will work.
Most tooth whiteners use one of two chemical agents: carbamide peroxide or hydrogen peroxide (the same stuff that will bleach your hair). When used in the mouth, carbamide peroxide breaks down into hydrogen peroxide and urea, with hydrogen peroxide being the active whitening ingredient.
In-chair whitening uses a much stronger formula of whitening agent and needs to be monitored closely so the gel doesn’t touch the gums.
Laser whitening uses a pigmented gel and then the laser activates the bleaching ingredient to penetrate further into the tooth.
This is a time-consuming and expensive method but has less sensitivity postoperatively.