Beconfident X1 Start Kit gives you peroxide-free teeth whitening for that beautiful white smile with no side effects like sore gums or tooth sensitivity. The Start Kit contains everything you need and is perfect if you've never had your teeth whitened before. It is very easy to use and each treatment only takes 15 minutes. You can easily mold the included mouth trays for an individual fit, just like at the dentist.The whitening effect on teeth comes from the resolution of surface stains, in part through the oxidation of organic compounds that are settled deeper in the enamel and dentin. The Beconfident method is based on a combination of cleaning agents (Surface Active Agents) and 32% active sodium bicarbonate. Unlike hydrogen peroxide, which can cause unpleasant tooth sensitivity and tooth pain, ours is mild and has no side effects.Everything you need to achieve the smile of your dreams is included in the package; 10ml peroxide-free whitening gel with fresh melon flavor for 10 treatments. 3 mouth trays (one extra) that hold the gel in place, a color guide and clear instructions in English.