Root canal treatment can last for 5-10 years. The root canal treatment process requires grinding open the pulp chamber and performing operations such as root canal preparation, which can damage the integrity of the tooth. The tooth tissue becomes brittle and dry after losing the nutrient supply from the pulp and is prone to splitting when subjected to high occlusal forces. Root canal treatment for anterior teeth only requires grinding away the lingual surface and resin filling to close the cavity, which has less impact on the tooth and generally lasts for more than five years. If a large defect occurs in the posterior teeth, inlays and full crowns need to be made to enhance the tooth’s resistance to pressure and prevent it from disintegrating. With the extension of time, the root brittleness gradually increases after root canal treatment, and the stress concentration is prone to root fracture. After root canal treatment, avoid spicy food, bite hard objects, to thin and soft, because the tooth will be more brittle, easy to crown fracture, also try not to use the root canal treatment side of the tooth to chew, but also with the doctor on the anti-inflammatory medicine, later after the elimination of inflammation and then fill the tooth.