Pain in the teeth at night when sleeping is a common symptom of pulpitis. The typical symptom of pulpitis is increased pain at night, which is considered to be caused by the body’s position, as the body is mostly in the upright position or sitting position during the day, when the head and face receive less blood flow, the pulpitis is correspondingly less swollen, and the pain is relatively light, but at night when the patient is sleeping in the horizontal position, when the head and face are rich in blood supply, the pulp will be swollen with inflammation, and the pain will be intense. There are other factors are psychological factors, people are more nervous in the daytime study, work, have a certain tolerance to pain, because the attention is diverted, and at night when sleeping is not too much, will be particularly sensitive to pain.