The Spa-dent whitening process is done all under the supervision of your Dental Professional. The gel formulation is placed in the dual arch mouth trays with the precise dosage of whitening material. The unique blue and red LED light activates the gel, providing powerful whitening with cellular stimulation. Hydroxyl radicals penetrate the tooth enamel to break down stains into progressively smaller particles. This process will penetrate but not harm or damage the tooth enamel, including caps, crowns and veneers.