THE IDEAL SOLUTION: Can be used correct protruding, concavity, overlapping, sparse teeth, to improve facial shape guidance to promote normal jaw development. MULTIFUNCTION: Suitable for adults and kids. Full protection from sleeping at night to sports at daytime. To whiten teeth provides great protection. THREE DIFFERENT STAGES: Kit use different hardness materials to make the correction process more complete. It can effectively change the breathing habits, correctly guide the eruption of permanent teeth, and establish a normal positional relationship. HIGH QUALITY PRODUCTS: Made of food-grade materials, BPA-free, odorless, no damage to teeth and oral soft tissues. Simple and practical, safe and reliable. QUALITY SERVICE: Use 3 types in 3 stages to better solve the problem.