Our most frequently used method of teeth whitening is a set of take-home trays, customized for your teeth, and using a carbamide peroxide gel. Trays with gel properly in place are worn anywhere from 30 minutes to overnight, depending on the gel concentration. We recommend daily use for two to four weeks or until desired results are achieved, depending on the depth of staining. The most severe of staining, like tetracycline stains, can possibly take several months. We recommend occasional short-term use for upkeep of your new bleached shade!