1.Do not fit over braces or caps. 2.If you are unhappy with the fit, you can simply remold as many times as you want. In order for this product to stay firm in the mouth, a person needs to have some existing tooth structure. 3.This product is not a denture or dental device. This item is intended only to enhance your appearance. Fitting Instructions: Place Adhesive into a cup of hot (almost boiling) water for 1 minute. This will make them flexible and ready to custom fit. Using a mirror, firmly position teeth covers over your existing teeth. Press them firmly against your teeth and gently pat the impression material with your thumbs behind your real teeth. Gently ease the teeth out of your mouth after 30 seconds and set them in a glass of cold water to cool. The impression material turns white when it is hardened. Material:Plastic Package included :1*upper braces or 1*lower braces or 1*upper and lower braces Note: Only through boiling water, the teeth can be soft and stick to your teeth.