Tooth pain at night is a common clinical complaint of patients, most often in pulpitis, which has typical features such as spontaneous pain, nighttime pain, pain that is not easily localized and radiating pain. So pulpitis patients themselves will feel pain in the evening, the reason and the night position has a certain relationship, normal people in the daytime is generally standing position, relative to the head and oral cavity in a high position, blood circulation will be reduced compared to the night, at night the patient is in a lying position, when the blood circulation is significantly accelerated, will feel more inflammation, pain will be more serious. However, there are many people who do not have any pain at all during the day, but some pain, but at night the pain will be unbearable, it is recommended to visit the stomatology department during the day for symptomatic treatment of the teeth.