Root canal treatment is divided into several steps, and there are differences in the way pain is handled at each stage: 1, if the pulp is opened and drained, it is normal to have pain, which is relieved in 2-3 days, because the inflammation of the pulp is serious at this time, you can eat amoxicillin and metronidazole tablets for anti-inflammatory and pain relief treatment, and the symptoms of pulp swelling and pain can disappear with the drainage. 2, root canal filling stage, at this time the doctor will remove the nerve, if the patient pain is obvious, maybe the pulp nerve is not completely inactivated, you can inject anesthetic pain, and then fill the root canal with dental cement, after filling the patient will not have toothache symptoms. 3, 2-3 days after root canal filling pain is still very obvious, and has not been relieved, it is likely that there is a leakage of filling, it is recommended to go to the hospital for follow-up, do It is recommended to follow up with the hospital to do an X-ray examination of the tooth’s root tip to clarify.