Tooth pain at the touch of the bite severe pain, may be acute apical periodontitis, tooth fracture, dental caries and other causes, according to the cause of the different, general treatment, drug treatment and surgical treatment. 1. Acute apical periodontitis: it is caused by the continuous development of inflammation, and may appear the symptoms of toothache and severe bite. At this time, the pulp cavity should be opened, the root canal should be unblocked, the inflammatory material within the drainage should be removed, and pus needs to be drained if there is an abscess. If the pain is unbearable, you can also use ibuprofen extended-release tablets, acetaminophen tablets to relieve pain. 2. Fracture: Generally, trauma, biting hard objects, etc., can lead to tooth fracture, at this time the pain is severe. If it is a crown fracture, root canal treatment can be carried out first, and then fixed and staked crown repair. If it is a root fracture, it can be splinted after the tooth is reset, and the root can be shifted in the tooth socket by traction, so that the broken end is fully exposed for restoration. 3. Dental caries: Caries damage that has reached the deep dentin layer can lead to symptoms such as pain when the tooth is touched and severe pain when biting. In most cases, dental filling treatment is needed, and generally composite resin bonding restoration, amalgam filling, etc. can be used for filling. There may be other causes of teeth that hurt when you touch them and severe pain in the bite. Medications should be used under the guidance of a physician.