The demand for tooth whitening continues to increase in the US. Whitening is available as an in-office treatment, as a take-home treatment utilizing custom fabricated trays or with many over the counter products. There has been considerable advancement in whitening technology since its inception, making the results more predictable and reducing the incidence of post-op sensitivity. The primary types of tooth discoloration are intrinsic and extrinsic. Extrinsic stains can become intrinsic by seeping into the interior of the tooth through pits, fissures and surface irregularities. Extrinsic discoloration is effectively removed during a prophylaxis. Intrinsic discoloration is improved with the use of peroxide containing whitening agents. This course discusses clinician responsibilities, ethical considerations, mechanism of action, side effects and management of patient expectations with tooth whitening procedures.