If a tooth has a black hole, as long as it is not a wisdom tooth, it needs to be treated. If it is a wisdom tooth, it can establish an occlusion with the opposite tooth, it can also be considered as filling treatment without extraction. If the tooth has no pain and there is no symptom of pulpitis after clinical examination, the tooth can be repaired at once and the shape of the tooth can be restored. If the tooth has been painful, or if the tooth has been examined to the pulp, root canal treatment is needed. The process of root canal treatment is more complicated and requires several follow-up visits, root canal preparation and disinfection and filling, followed by tooth repair, either resin repair or full crown repair with a brace. You should go to the hospital as soon as possible for examination and treatment of a black cavity.