Endodontitis treatment is divided into pulp inactivation, root canal preparation, root canal filling several steps, the patient needs to come to the hospital for 3-6 treatments, about 1 time per week, after the completion of each step, may be in the treatment of 2-3 days will have a certain degree of pain, postoperative pain is normal, but if the pain is more intense or persistent unrelieved, it is recommended that the patient to the hospital in time to follow up, after the doctor corresponding to the pain will generally be relieved. After appropriate treatment by the doctor, the pain will usually be relieved. It is also normal to have some swelling and pain for 2-3 days after root canal filling. If the swelling and pain does not go away or worsens, it is also recommended that the patient go to the hospital in time so that the doctor can look for the cause of the disease and make appropriate treatment. In addition, if the pulpitis after root canal treatment for a period of time does not hurt, but after a period of time the patient again feel the tooth pain, also need to go to the hospital in a timely manner to let the doctor for examination and treatment. Because the treatment of endodontic infection is not 100% successful, there may be some complications, if there is still pain after treatment for a period of time, it is necessary to check whether there is a complication of root canal treatment, so that the doctor can make appropriate treatment.