Material : Silicone Item Type : Orthodontic Braces Model Number : Mouth Guard Material : Medical TPE Color : transparent Size : 6*5.5*2.5cm Notice : Please do not soak it in hot water over 70° Feature 1 : Dental Alignment Straightener Feature 2 : Silicone Orthodontic Braces Appliance Feature 3 : Teeth Retainer Bruxism *D1 is soft, the first stage, use 2-3months. *D2 is moderate, the second stage, use 4-5 months. *D3 is hard, the third stage, use 3-4 months. *The correction process is divided into three stages. After using D1 for 1 month, you can gradually use D2 together. Use D2 on daytime and D1 at night. When you fully adapted to D2, you can be gradually use D3 together. Use D3 on daytime and D2 at night. You must wear it every day, normally, there will be noticeable improvement in 4-6 months.