There are certain disadvantages to wearing a crown on a worn out tooth. Because the good tooth grinding off may cause the tooth hot and cold sensitivity symptoms, and if the tooth preparation is not careful, it is easy to cause the tooth through the pulp, that is, nerve leakage phenomenon, then need to do the root canal treatment of the tooth. In addition, if a single tooth is worn out to do porcelain crowns, and there is no missing tooth next to the tooth, this is not desirable, there is no need, unless the tooth has a hidden crack or has a certain sensitivity symptoms, wear and tear is heavy or in order to raise the bite, this situation needs to be worn out to do porcelain crowns. However, if there are missing teeth and the adjacent teeth are missing teeth, you can first choose the implant denture; if you cannot choose the implant denture, you can only choose the method of grinding off the good teeth to make the crown bridge; in addition, you can do the movable denture, which needs to be removed every day and has certain disadvantages.