Opalescence Boost in-office power whitener is a chemically activated gel that offers brighter, whiter teeth after about an hour in the dental chair. The powerful 40% hydrogen peroxide gel is chemically activated, meaning no LED teeth whitening lights are necessary with Opalescence teeth whitening, as lights do not affect the whitening results. Using the unique double-syringe configuration, the clinician activates the 40% hydrogen peroxide formula just prior to application, ensuring every dose of Opalescence Boost whitening is fresh and effective.