When pain and swelling occur in the root of the tooth, it is recommended that the patient go to the dentistry department of a regular hospital as soon as possible, so that a doctor can examine and diagnose the cause of the swelling and pain in the root of the tooth. X-rays are usually needed to observe the inflammation around the root of the tooth. If the root pain is caused by pulp necrosis, root canal treatment is needed, after which the inflammation around the root will be eliminated. Root canal treatment takes about three weeks, and the inflammation can be eliminated by following the doctor’s instructions once a week and following the doctor’s instructions carefully. If the root of the tooth is swollen and painful due to periodontal reasons, a series of periodontal treatments such as periodontal scaling, scraping, and leveling can be carried out to solve the phenomenon of swollen and painful tooth roots.