In-office teeth whitening: This is a professional teeth whitening treatment performed by a dentist. It typically involves the application of a highly concentrated bleaching agent to the teeth, which is activated by a special light or laser. The entire process can be completed in one visit and usually takes about an hour.

At-home teeth whitening: This involves the use of a custom-made tray filled with a lower concentration of the bleaching agent that the patient can wear at home for several hours a day or overnight. The at-home treatment usually takes about two weeks to achieve the desired results.