The difference between periapical periodontitis and pulpitis is that the main manifestation of periapical periodontitis in milk teeth is biting pain, and if you knock on the tooth with forceps, the root and bone area is particularly painful, while in pulpitis it is mainly immobile and automatically hurts at night when you sleep. There is a difference between hot and cold stimulation of periapical periodontitis, which is not very painful, and hot and cold stimulation of pulpitis, which can be very painful. Periapical periodontitis is relatively more serious than pulpitis, although the symptoms are not as obvious as pulpitis, mainly biting pain, not very painful from morning to night, while pulpitis is a long-term severe pain. The main treatment option for periapical periodontitis is root canal therapy. If parents and friends find such symptoms in their children, please promptly take them to a professional hospital to see a dentist for an examination, dental radiographs and timely treatment accordingly.