A burst of pain a burst of pain is generally caused by pulpitis, acute pulpitis for paroxysmal severe pain, radiating pain, chronic pulpitis for paroxysmal dull pain, specific as follows. 1. Acute pulpitis: pain is characterized by spontaneous pain, paroxysmal pain, pain at night, pain will radiate along the trigeminal nerve to the affected side of the upper and lower jaw, face and ear temporal, often difficult to locate the specific location of the affected tooth pain. Hot and cold stimuli may stimulate severe pain or aggravate the pain. 2. Chronic pulpitis, periapical inflammation: mostly paroxysmal dull pain, lasting longer, rarely spontaneous severe pain. Severe occlusal pain and knocking pain can occur, this time may be the occurrence of apical periodontitis. There may be other reasons for the tooth to ache and not ache at the same time, so it is recommended to go to the hospital in time.