Lower incisor pain may be caused by the occurrence of dental disease or trauma, such as pulpitis, apical periodontitis or periodontal membrane inflammation, which can correspond to root canal treatment or jaw adjustment observation. 1. Pulpitis, apical periodontitis. Lower incisor pain, may be tooth decay caused by pulpitis, periapical inflammation, pulpitis will produce persistent severe pain in response to external hot and cold stimuli, periapical inflammation can occur bite pain, pulp inactivation, treatment is usually root canal treatment to remove the infected pulp. 2. Periodontal inflammation. Fillings too high may appear occlusal high point caused by periodontal membrane inflammation, clinically adjusted to deal with, if the trauma caused by the need to adjust the jaw fixed observation, the symptoms of pulpitis root canal treatment. Lower incisor pain may also be cardiogenic dental pain, often after strenuous exercise, accompanied by radiating pain, the need for cardiac surgery or nitroglycerin medication, lower incisor pain, it is recommended to go to the hospital to check the cause of targeted treatment.