When the root of our tooth is inflamed and the pulp is inflamed, we need to do root canal treatment, so what is root canal treatment, now I will talk to you briefly. Root canal therapy is to completely remove the infected material from the pulp cavity and disinfect the pulp cavity, then fill the space previously occupied by the pulp with a material that is not harmful to the body, thus reducing the possibility of reinfection, and finally repair the defective tooth to restore the function of refusing to cut. The key to root canal therapy is the thorough cleaning and disinfection of the root canal system, which requires extensive knowledge and a patient and meticulous work ethic due to the complexity of the tooth’s root canal system and with the help of some auxiliary facilities such as X-rays, root canal measuring instruments, CT and microscope when necessary. Root canal treatment is the main treatment for endodontic and periapical diseases, and is an important part of endodontics. The steps of root canal treatment are as follows: 1, root canal preparation: operate under painless and aseptic conditions, open the pulp cavity of the tooth, extract the pulp (nerve, blood vessel) in the root canal, unblock the root canal, measure the length of the root canal, and enlarge the root canal. 2, root canal disinfection: rinsing, root canal sealant. 3, root canal filling: fill the root canal tightly with biocompatible material, eliminate the dead cavity, close the apical hole, and stop the bacteria from invading the root canal again. Tip: After the root canal treatment, the tooth itself will be less hard, it is recommended to do a brace to protect it from splitting the crown for a long time, by then, if only the crown breaks, the root can barely be used; if the root also follows the crack, it will only be extracted and we will feel sorry for it.