The service life of a root canal treated tooth is highly dependent on the patient’s chewing habits, dietary habits, intraoral occlusion, etc., and generally lasts at least 3-5 years. Once the pulp is removed, the tooth will become more susceptible to breakage and fracture as the nutrient supply is impaired and the brittleness of the tooth increases. If the patient has the habit of chewing on the side, or is used to eating hard foods, or has excessive biting force, etc., it will increase the risk of splitting the crown of the tooth. Therefore, after root canal treatment, it is generally recommended to make a brace to wear on the crown of the tooth, just like a helmet worn by motorcyclists, to protect the tooth from splitting, which not only prolongs the life of the tooth after root canal treatment, but also is aesthetically pleasing. A brace is recommended to protect the affected tooth after root canal treatment in order to prolong the use of the affected tooth. In case of splitting, you should also go to the hospital dentistry department in time.