Critical appraisal. Power bleaching.

From anecdotal reports, many patients and some dentists believe that using a high-concentration whitening agent and an auxiliary light source (i.e., power bleaching) provides the best whitening service available. Some believe that the light provides additional whitening. Some believe that it provides a result that cannot otherwise be obtained. Others believe that it whitens far more quickly. The present review investigates the evidence available to support or refute these claims.