Root canal treatment is often used to treat various types of pulpitis, pulp necrosis and various types of periapical inflammation; diseased anterior teeth that are not suitable for preserving the living pulp; posterior teeth with large crown damage that require pile or porcelain restoration, as well as transplanted teeth and replanted teeth. The process of root canal treatment mainly includes root canal preparation, root canal disinfection, and root canal filling. 1. root canal preparation: after opening the pulp, the infected pulp tissue, pathogenic microorganisms, and food residues in the root canal are removed with a pulp extraction needle or root canal file, and the root canal length is measured to prepare the root canal interval into a certain shape. 2. root canal disinfection: after the root canal preparation is completed, root canal rinsing is performed, and the commonly used rinsing agents include sodium hypochlorite solution, citrate solution, etc. Citric acid solution. There are many ways of root canal disinfection, including drug disinfection, ultrasonic disinfection, microwave disinfection and laser disinfection; 3. Root canal filling: By choosing suitable filling materials, the prepared and disinfected root canals are filled and the root canal area is closed and isolated from the oral environment to avoid reinfection of the pulp or root canal cavity. It should be noted that root canal treatment involves the treatment of the dental nerve and the whole process is painful and delicate, resulting in a long treatment time, during which various chemical agents are used for disinfection and cleaning. After root canal treatment, patients should eat mainly liquid or semi-liquid food and should not bite too hard. In addition, due to the complexity of the root canal operation, it is recommended that patients go to a regular hospital for treatment.