Periapical periarthritis is divided into acute and chronic: chronic periapical pain is not obvious. Acute periapical pain is characterized by severe pain, the ability to locate, significant occlusal pain, pressure pain and swelling in the corresponding apical area, and in severe cases spread to the face, reaching a peak when an apical abscess is formed, with pain relief after the abscess breaks down and drains. Pain management of periapical infection: First of all, the tooth should be treated openly by drilling the tooth, opening the pulp chamber, removing the pulp, unblocking the root canal, establishing drainage, and if an abscess has formed, incision and drainage. In severe cases, oral anti-inflammatory drugs are used, and pain relief is usually achieved in about a week. After the pain is relieved, root canal treatment and other treatments can be performed. Reminder: The time for pain relief from periapical infection varies from person to person and from condition to condition, and in severe cases it can also cause interstitial infection. Treatment will continue after relief.