Pain in the teeth when sleeping is usually a common state of pulpitis. Pulpitis is a disease that causes swelling and exudation of the pulp of the teeth due to the step-by-step development of caries infection to the pulp. The pain is typically worse at night, usually during the day when the person is in an upright or sitting position, the blood supply to the head and face is relatively low and the pain is not particularly intense. However, at night, as most people are lying down, the head is at the same level as the whole body, and the head and face will receive more blood. At this time, the corresponding swelling and exudation will also increase, and the pain will also appear to increase, and for this situation, it is recommended that patients go to the professional dentistry department as soon as possible during the day for symptomatic treatment of the teeth.