This is the most sought after cosmetic treatment for whitening teeth and also the most effective one. In-office tooth whitening is carried out by professional dentists and includes popular procedures such as Zoom Whitening System and Britesmile. The dentist cleans the mouth and applies a protective gel around your mouth. A special gel containing peroxide is then applied on your teeth. A special light is used to activate this gel and it penetrates enamel to bleach the teeth hence, this is also known as laser teeth whitening. There might be initial side effects which subside in a few days.

These come as the one-size-fits all whitening trays or custom fitted trays for the patient. The custom fitted trays are preferable since they tend to be more effective and easier to work with. This method requires wearing of the trays with whitening gel in the mouth for a fixed period and number of times each day. They have been shown to be reasonably effective in many cases although the one-size-fits-all has been often shown to be ineffective due to the improper contact of whitening gel and teeth.