Teeth usually do not hurt but when you bite, there are several situations: 1, the tooth has a hidden crack, which means that there are some cracks in the biting surface of your teeth, when you bite something when you touch that crack, there will be very serious pain. In this case, if the crack is not very deep, can be improved through the doctor’s filling, if the crack is deeper, you need to do root canal treatment, root canal treatment, and then do a porcelain tooth, to wrap it up, to prevent it from cracking; 2, periapical inflammation, is the root of the tooth after inflammation, the inflammation spread out to form. This situation we need to do root canal treatment to solve its pain; 3, periodontitis, periodontal is fixed around the tooth tissue, when it occurs inflammation leads to alveolar bone resorption, a bite on the periodontal impact will cause pain. This situation we need to do is periodontal treatment; 4, trauma jaw, can be a dental defect, can also be periodontal trauma, this situation needs to do is to adjust the jaw; 5, if the tooth in the early just filling treatment, usually do not hurt a bite on the pain, it may be your filling or porcelain teeth, is added to the top of the tooth, there is a local high point caused by the pain. This time you need to go to the Department of Dentistry to adjust the grinding, adjust the change, after removing the high point, the symptoms will naturally disappear slowly.