In-office whitening is done in the dental office. There are many in-office tooth whitening products available to dentists. These products are much stronger than the take-home bleach products, since in-office products have more hydrogen peroxide, the active ingredient. They are sometimes used with a light or laser.
The in-office procedure is usually completed in about one hour. To help protect the mouth, the patient’s gum tissues are covered either with a rubber dam (a thin sheet of latex rubber that keeps the teeth dry during treatment) or a protective gel.