The painful sensation of biting after the crown is installed: First, the state of the bite should be checked, which may be caused by the incorrect occlusal relationship between the crown and the opposing teeth. At this time, you can ask the doctor to carry out the occlusion test, through the occlusion paper to test whether there is a high point of occlusion, by grinding the high point of occlusion, the chewing pain will be gradually eliminated. Second, it is more complicated, most likely because the root canal treatment of the abutment teeth is not perfect. If this is the case, the original cement should be completely removed, root canal treatment should be performed again, and then crown restoration should be performed after the pain disappears. Third, the root itself is fractured, which is difficult to detect with the naked eye and requires a CBCT for diagnosis. Once the fracture occurs, the affected tooth may need to be extracted.