Inflammation and pain in the root of the tooth can be reduced by taking anti-inflammatory medication orally, and then go to a regular medical institution to do a general oral examination or even radiological examination to clarify the affected tooth, and decide on the treatment plan according to the condition of the affected tooth. If the affected tooth can be retained, root canal treatment is required. After opening the tooth, the root canal will be cleaned out, and then the root canal will be sealed with medication to alleviate the inflammation of the root, or oral anti-inflammatory medication can be taken during the treatment. If conservative treatment is considered, oral anti-inflammatory medication is needed to reduce the inflammation and control the inflammation to a chronic state to relieve the pain, and the apical inflammation of the tooth can only be relieved after a complete root canal treatment.