Toothache in bed at night is generally due to 2 reasons. The first reason is due to the postural factor. Toothache at night is mostly seen in pulpitis, and its typical symptom is that the pain is aggravated at night. During the daytime, most people are in the upright position and seat, when the head and face are relatively high, receiving relatively less blood, corresponding to the pulp swelling is also light, the corresponding pain is not particularly obvious, but at night, when people are in the lying position, the head and face will receive more blood, the corresponding swelling will be obvious, and the pain will be aggravated. Another aspect is due to the psychological state of the person, who is more nervous during the day due to work and study life. At this time, the patient is not particularly sensitive to less serious pain and may not feel it very deeply, while at night, especially before going to bed, the patient will especially feel the tooth pain, and it will gradually increase, which is also a common clinical reason.