Dental drainage, i.e., open pulp drainage, is one of the steps of root canal treatment. This procedure can drain the pus from the pulp abscess, and it is mainly applicable to diseases such as pulpitis and apical periodontitis, and it needs to be carried out in time when the periodontal abscess shows pain and throbbing pain. 1. Pulp opening and drainage is a treatment means to open the pulp cavity and release the pressure in the pulp cavity through dental power instruments. Pulp opening and drainage is used in the treatment of acute pulpitis, acute periapical inflammation and other diseases. 2. It is recommended that patients should go to the hospital for diagnosis in time when pulpitis and apical periodontitis occur. After judging the affected teeth by using hot and cold diagnosis and percussion, the patients should take the treatment of open pulp drainage, and then carry out the perfect root canal treatment, and consider crown restoration for the teeth after root canal treatment. The patient should follow the doctor’s instructions to take the open pulp drainage surgery, and the postoperative review on time. Patients should pay attention to their diet after the open pulp drainage surgery, and should eat less spicy and stimulating food, such as chili peppers, garlic, etc., and avoid eating too hot food. After surgery, patients should take medication strictly according to the doctor’s instructions, pay attention to oral hygiene and brush teeth on time.