The first stage braces: hardness: soft, use cycle: about 1 month, function: used to adapt to aligners and primary corrections. The second stage braces: hardness: hard, use cycle: about 2 to 3 months, function: further adapt to correction. The third stage braces: hardness: hard, use cycle: about 3 to 6 months, function: increase the correction strength, for later correction Dental Appliance Tooth Orthodontic BracesTrainer Dental Braces Teeth Trainer Alignment Braces MouthpieceFor Adults Orthodontic Braces Features 1.Three-stage physical correctiontherapy will provide 3 different hardness bracesto correct crowded mild dentition, dislocationand uneven teethstep by step. 2.Soft and flexible food grade TPE material, odorless and non-toxic, can improve orthodontic rebound with enhanced wear comfort and fit, widely suitable for different people. 3.Each dental brace is individually stored in a high quality case for carrying convenience and improved hygiene, and the transparent color appearance will enable invisible looks to bring your confident smile back decently. Suitable Age: AdultPhase: Phase I(D1), Phase II(D2), Phase III(D3) Instructions for Three Stages Use: The First Stage(D1): soft; adapt to a few minutes for the first use, wear 12 hours a day after adaptation, use time 1-2 months. The Second Stage(D2): medium elastic hardness; suitable for mild and moderate teeth, insignificant, can be used directly, use time is 2-3 months. The Third Stage(D3): A stiffer material;suitable for further aligning the teeth or used as a holder to limit tooth movement, use for 3-6 months. Kindly Noted:1. Allow yourself to adapt for a period of time, such as 5-10 minutes; 2. If you feel uncomfortable, you can take it off first, take a rest and then wear it; 3. Don't bite too tight at the beginning, slowly increase the strength of the bite; 4. Wear 1-2 hours a day after adaptation, and then extend the wearing time. How to Use: 1.Hold the mouthguard with massage point down. 2.Put the braces in your mouth and keep your tongue in the position of the tongue block. 3.Gently bite the mouthguard and close your lips, keeping your nose breathing.