Crest Whitestrips Supreme provides custom tray-level whitening in the form of a strip. It contains 14% hydrogen peroxide—the highest concentration available in a professionally dispensed take-home whitening regimen—and can remove up to 20 years of stains in 21 days. The strip is preloaded so that patients receive a safe, consistent, and controlled dose every time. The slim design of the strip ensures that the dose comes in contact with teeth only, without increasing exposure to the gingiva. For more information, call (800) 543-2577.