Teeth can not eat something when you bite the pain may be the emergence of apical periapical inflammation or fracture of the tooth, the specific need to go to the hospital for radiography. 1. Periapical inflammation: when the tooth caries infected pulp caused by periapical inflammation, there will be biting pain, can not chew food, x-ray examination in the periapical low-density shadow, need to carry out endodontic treatment, eliminate periapical inflammation after biting pain will disappear. 2. Tooth fracture: when the tooth chews too hard food or is hit by external forces caused by tooth fracture, chewing food will also appear obvious pain, X-ray examination can be found in the fracture line, generally need to be adjusted to fix the jaw, the emergence of endodontic symptoms need to carry out root canal treatment. Teeth can not eat something a bite pain, it is recommended to go to the hospital in time to check the cause as soon as possible to deal with, so as not to affect the chewing function.