Root canal treatment is usually necessary when tooth decay is severely painful or develops into endodontics and periapical disease. 1. Root canal treatment is a method used to treat diseases such as endodontics and periapical disease. It mainly involves the use of professional instruments to clean and sterilize the root canals, and then tightly fill the canals, which can effectively remove the infected pulpal tissues, thus achieving the purpose of controlling the infection and promoting the healing of periapical diseases. 2. When the tooth is decayed, it is recommended to carry out timely treatment, if the pain is serious, it is recommended to carry out root canal treatment to prevent endodontics and periapical disease. If the tooth is not treated in time, not only will the pain recur, but it may also become infected and develop into endodontics and periapical disease. Therefore, patients are advised to get treatment without delay.