Patients with posterior sulcus tooth pain are usually due to pulpitis or apical inflammation caused by tooth decay, or may be pericoronitis caused by wisdom teeth obstructing the tooth. Toothache should be examined in the hospital by performing hot and cold examination to observe whether there is pain from hot and cold irritation, percussion for biting pain, or whether there are wisdom teeth, red and swollen gums, and pericoronal overflow of pus. Generally, patients can take some anti-anaerobic drugs, such as metronidazole and ornidazole, etc. If the pain is severe, you can take oral painkiller ibuprofen, etc. If it is pulpitis or apical inflammation caused by tooth decay, root canal treatment is needed. If it is pericoronitis of wisdom teeth, pericoronial rinsing is needed in the hospital, and repeatedly inflamed wisdom teeth need to be considered for extraction.