Teeth do not dare to bite something, there are several possibilities: 1, periodontal disease, periodontal disease can easily lead to loosening of the teeth, when biting easily cause teeth loosening, will stimulate the periodontal membrane to produce pain. 2, tooth apical inflammation, tooth apical inflammation, when biting pressure on the apical inflammation, it is easy to appear pain, so teeth do not dare to bite something. 3, teeth have the phenomenon of hidden fracture, in the case of hidden fracture In the case of biting, it is easy to have a painful sensation, and sensitive to hot and cold, sour and sweet. It is recommended that regular checkups be conducted, if it is periodontal disease, periodontal treatment should be done in a timely manner, apical inflammation should be done root canal treatment of teeth, while teeth with hidden cracks can be filled in light cases, and in heavy cases, pulp drainage is needed, and if it has caused tooth splitting, the tooth needs to be extracted in a timely manner.