Get your teeth white today. This professional teeth whitening kit has 2 gels of Premium Expertwhite 35% Carbamide Peroxide Gel (3cc each, providing 8 teeth whitening treatments) and ready-to use Comfort Flex silicone teeth whitening tray (may be used for years) This is the strongest teeth whitening gel available. Only 30 minutes per whitening treatment, once a day until desired results. The expertwhite kit includes a ready to use soft silicone tray that fits comfortable over upper and lower teeth to hold the whitening gel close to surface of tooth. gels starts off by removing surface stains from teeth, then penetrates to remove decades of tooth discoloration. Directions: Simply add a bead of gel along upper and lower part of tray and wear over teeth 30 minutes, once a day in succession. Visible results after first treatment. Dentist approved teeth whitening kit. Guaranteed 10 shades whiter teeth.