Braces, i.e., clinical crowns, loose for many reasons, there may be secondary caries, there may be bonding materials fall off, there may be loose abutment teeth, we have to deal with the cause, including remake crowns, replace the second bonding with bonding materials, and choose implants after extraction. 1:If there is secondary caries in the abutment tooth, we have to go to the medical institution to remove the braces to fill and repair the abutment tooth with secondary caries and remake the crown. 2:If the bonding material is detached, it is necessary to remove the braces and replace them with a material with stronger bonding ability for secondary bonding. 3:If the abutment teeth are loose, according to the looseness of the abutment teeth to see whether the abutment teeth still need to be retained, if the abutment teeth reach the third degree of looseness, we need to extract and then implant. To summarize, loose braces, we have to treat according to the cause of the disease, can be remade after root canal treatment, can also be replaced with bonding materials for the second bonding, can also be removed after the choice of implantation. Specific treatment patients should consult the doctor in time to clarify the cause of the disease, avoid self-medication or treatment.