Toothache with a bag on the bed of the tooth may be due to periapical abscess, root fracture, periodontal abscess, apical cyst, osteomyelitis of the jawbone and other symptoms, it is recommended to go to the hospital for specific film examination and treatment. 1. Dental radiographs with low-density shadow at the root tip and tooth biting pain may be the result of apical periapical inflammation, and the swelling and bagging should be the result of periapical abscess. 2. Root fracture caused by trauma to the tooth may cause pain in the tooth. 3. If the tooth has loss of attachment and the swelling is close to the gingival margin, it is usually a periodontal abscess. 4. An apical radiograph suggesting a distinct white line in the apical region may be an apical cyst. 5. Osteomyelitis of the jaw bone due to radiotherapy or long-term bone inflammation will bring toothache with a bag in the bed of the tooth.