Teeth bite things hurt not bite things do not hurt is called occlusal pain, may be the existence of hidden cracks or root fracture, apical periodontitis and other diseases caused by the following. 1. Concealed fissure, root fracture: is due to the weak structure of the tooth and excessive chewing force caused by the crown of the small cracks, cracks deep into the pulp, chewing force exerted on the concealed fissure can appear occlusal pain. Cotton roll biting diagnosis, probe force probing can appear obvious pain, so as to determine the location of the hidden crack. 2. Periapical periodontitis: chronic periapical periodontitis usually has no obvious self-conscious symptoms, some of the affected teeth have occlusal pain when chewing, and the affected teeth may have a history of endodontic disease, recurrent swelling and pain, or endodontic treatment. Bite pain may have other causes, it is recommended to go to the hospital in time, early targeted treatment.