Why do root canal treatment? 1.To relieve the patient’s pain and prevent the spread of infection: teeth that already have pulpitis will continue to deteriorate to pulp necrosis or even periapical lesions, a process that is quite painful, and root canal treatment can not only relieve the patient’s pain, but also shorten the entire course of the disease to prevent the deterioration of the disease 2.To keep the tooth as much as possible to avoid extraction: the purpose of root canal treatment is to preserve the pulp or periapical tissues, so that The purpose of root canal treatment is to preserve the pulp or periapical tissues of the tooth, so that the tooth is still in a good state of health in its supporting tissues and avoid extraction or continued deterioration to the fate of disintegration. 3. Root canal treatment not only extinguishes the germs and their decomposers and toxins in the root canal, but also treats the trauma of the periapical tissues, promotes the repair and healing of the periapical tissues, and eliminates the source of the oral lesion infection. Root canal therapy has the following main advantages: 1. Root canal therapy can maintain the integrity of the natural tooth arrangement, prevent the displacement of adjacent teeth, tooth decay and periodontal disease, prevent the loss of too much supporting bone after tooth extraction, which affects the appearance of the face and the stability of dentures, and can solve some difficulties in the production of dentures due to the maintenance of teeth. 2.To avoid the incorrect bite caused by early extraction of teeth, thus eliminating the trouble of orthodontic treatment. 3. For patients with serious systemic diseases (e.g. congenital heart disease, diabetes, tuberculosis, hemophilia, pernicious anemia, rheumatic fever, leukemia, hypertension, syphilis, etc.), the use of root canal treatment can reduce the risk. Since root canal treatment keeps the natural tooth intact and biologically appropriate without removing the affected tooth, it eliminates the need to use adjacent teeth to support the denture, eliminates abnormal pressure, and reduces the cost of denture fabrication.