After the teeth to the nerve is generally need to do braces, so as not to break or fall off the teeth, affecting the normal use. 1. After the teeth to the nerve, the teeth will completely lose nutrition, at this time the teeth are more fragile, easy to break, and resistance is relatively weak, chewing process of the teeth breakage significantly increased, if not wearing braces, the teeth are easy to break or fall off. 2. When the nerve of the tooth is killed, it may affect the bite and easily cause pulpitis or periapical inflammation. Without braces in this case, it is impossible to form a protective effect on the teeth, which may cause pain in the alveolar bone, resulting in the patient not being able to chew and eat normally. After killing the nerve of the teeth, it is necessary to combine with the doctor’s advice to choose the right braces for correction and fixation, which can prevent the teeth from shifting, falling off and breaking. Avoid chewing hard food for a short period of time, otherwise the degree of damage will be significantly aggravated, which is not conducive to recovery.