1, before doing braces after root canal treatment: (1) Before doing braces after root canal treatment, you should try to avoid biting with the affected side, especially hard objects (such as bone and nut food) to avoid tooth chipping. Generally, the doctor will make temporary braces (i.e. temporary crowns) to protect the tooth after the tooth preparation during the braces. (2) Avoid sticky foods so that the temporary sealing material of the tooth will not fall off after root canal treatment. (3) Keep rinsing your mouth after meals and brushing your teeth in the morning and evening to avoid the accumulation of food debris and the formation of plaque and tartar, which will lead to redness and swelling of the gums and affect the dental preparation, braces wearing and oral health during the follow-up consultation. 2, after doing braces precautions: (1) when first wearing may have mild discomfort, patients should be patient practice using, gradually adapt. Generally, after a week there is still discomfort or pain, should be timely follow-up repair. (2) You should keep brushing your teeth carefully, especially the joint between braces and abutment teeth, to avoid the accumulation of food residue and the formation of plaque and tartar, to prevent gingivitis, gum recession and secondary caries. Floss can be used to clean between the teeth. (3) If the braces are porcelain crowns or all-porcelain crowns, it is not advisable to bite too hard food, because porcelain crowns or all-porcelain crowns may be chipped by large biting force. If there is chipped porcelain and other conditions, you should go to the hospital in a timely manner, usually need to remove the original porcelain or all-porcelain crowns, and then re-do the braces repair.