Whether a tooth needs root canal treatment or not can be found out by patient symptoms, clinical examination, imaging examination, etc. 1. Patient symptoms: Root canal treatment is needed when tooth decay or defects reach the pulp and cause pulpal inflammation and necrosis, etc. Patients may have symptoms such as spontaneous pain, night pain, radiating pain, biting pain, and swollen gums. Patients may have symptoms such as spontaneous tooth pain, night pain, radiating pain, biting pain, swollen gums and so on. 2. Clinical examination: If the tooth is decayed to the pulp, the clinical examination may reveal the pulp point. Pulp hot and cold tests can check the inflammatory state of the pulp, which may cause excitation pain, delayed pain and so on. 3. Imaging: X-ray examination of the crown of the tooth low-density shadow will be involved in the pulp, or periapical low-density shadow of the tooth. Specific advice to consult a specialized doctor.