Root canal treatment drainage, i.e., open pulp drainage, belongs to the emergency treatment of acute pulpitis and acute apical periodontitis, through the drainage of exudates, etc., can reduce severe pain, but the drainage should not be open for too long, 3 days after the temporary seal in a timely manner, as follows. 1. Acute pulpitis: open the pulp under local anesthesia, drain the inflammatory exudate and release the high pressure in the pulp cavity, remove all or most of the pulp to reduce the pain of the affected tooth. Followed by root canal treatment and crown restoration of the affected tooth. 2. Acute periapical inflammation: open the pulp under local anesthesia, unclog the apical foramen, establish a drainage channel, drain the apical exudate and pus, relieve the pressure of the apical part of the root, the pain of the affected tooth can be relieved, and then carry out the root canal treatment after the acute inflammation subsides. It is recommended to visit a regular medical institution to receive professional treatment.