Root canals are generally painless after 2 to 7 days. The specifics are related to the individual’s tolerance level. Root canals are a common means of dental treatment. Pain may occur during or after root canal treatment. The root sealing medication in the root of the tooth during root canal treatment can irritate the apical tissues, and the nerves in the apical area can react with pain. Alternatively, pain may occur if you accidentally bite something during root canal treatment. The filling material in the root of the tooth after root canal treatment can also cause swelling and pain in the apical area, which will disappear after 2 to 7 days. Oral painkillers can be taken to relieve severe pain after root canal treatment. If the root canal treatment is painful for a long time, there may be occlusal high spots, etc., which need to be adjusted in time. Therefore, the pain disappears in 2~7 days after root canal treatment, and the presence of prolonged pain needs to go to the stomatology department for medical treatment. Medications should be used under the direction of a physician.