A toothache that occurs mostly in the second half of the night is a manifestation of endodontitis, and is related to changes in body position and mental factors. Nocturnal toothache is a symptom of pulpitis, the pain is not obvious during the day, but at night the pain is aggravated or even woke up from sleep. It is mainly due to the change of sleeping position at night, from vertical position to horizontal position. The pressure in the pulp cavity increases and the pain is significantly worse. During the daytime, the attention is more distracted, it is not easy to feel a certain part of the discomfort, the pain is not obvious. At night the sympathetic nerves are excited, attention is focused and there is significant pain. Changes in body position at night increase the pressure in the pulp cavity, while concentration leads to more pronounced toothache at night, you can go to the dentist.