Lactation cavity pain rot to the nerve, indicating that there has been a pulpitis or apical periodontitis, need to go to the hospital as soon as possible for root canal treatment. Cavities are often seen in caries, caries to the pulp cavity can cause pulpitis, spontaneous severe pain, pulpitis further development will cause pulp necrosis leading to periapical periodontitis, chewing food up and down the biting pain, not only affects eating, but also affects sleep. Clinically, root canal treatment is generally carried out to remove the infected pulp tissue to eliminate pulpal inflammation, which can relieve the pain, to be asymptomatic after the root canal filling, stump core crown restoration. Dental diseases in the mouth are recommended to go to the hospital in time to avoid affecting the health of the body.