Despite the presence of several tooth whitening systems, tray-based whitening has become the most widely used type of at-home bleaching products during the last decade. It uses a fabricated plastic tray for comfortable fit over the teeth of a person. Bleaching gel is placed into the tray which is worn for multiple hours a day for some weeks as the effects of the process of whitening take place.

Teeth whitening is a safe and effective method of teeth bleaching but requires the realization that majority of tooth whitening processes will not have the direct supervision of a dental professional. Because of this, a person must be certain about the safety of the bleaching product they are using as well as knowledge of the product in a correct manner. Inability to meet any of the conditions may cause damage or harm.

The dentist and over-the-counter stores offer different varieties of tooth bleaching products. It is not an assumption that available tooth whiteners has been approved by the U.S. Food and Drug Administration. Tooth whiteners are not categorized as drugs and therefore not regulated by the agency.

A set of guidelines that sets the standards for both safety and effectiveness has been established by the American Dental Association. At their own expense and effort, manufacturers can present the result of their product research and trials to the ADA. The