Opalescence Go by Ultradent is the latest at-home whitening system that provides professional whitening treatment in the comfort of your home or when it is most convenient for you. The ultra-strength Hydrogen Peroxide in the Opalescence Go system helps whiten your teeth as quickly as possible. Furthermore the Potassium Nitrate contained in the gel helps to reduce sensitivity and the Fluoride helps fight off tooth decay while aiding enamel strengthening. The combination of these ingredients not only helps whiten your teeth but also improves their general health for a complete bleaching experience. With the Opalescence Go UltraFit tray design, the maximum amount of gel will stay in contact with the teeth during the whitening application. Each box contains 10 trays: 10 for the bottom teeth, 10 for the top teeth. Opalescence Go 15%, Mint flavored UltraFit Tray Expiration Date: March 31, 2020 Wear for only 15-20 minutes a day No dental visits, no impressions necessary for a brighter and whiter smile!