A cavity in a blocked tooth that does not heal can be solved by surgical treatment. 1. Cavities usually heal on their own, but if they remain unhealed for a long time, they need to be treated by a professional doctor through oral surgery. The surgeon will trim the patient’s gums and their alveolar sockets accordingly, then surgically suture the gums on both sides of the alveolar bone, remove the sutures after 7 days and wait for the alveolar bone to develop slowly, during which time the body’s new tissues will grow to fill in the cavity until it is completely healed. 2. Before the cavity heals, the tooth will form a depression, patients need to carefully brush their teeth and rinse their mouth to ensure oral hygiene, to prevent bacterial infections that hinder the healing of the cavity. If the cavity does not heal, the patient should consult a doctor and take appropriate treatment according to the doctor’s recommendation.