When a tooth is badly worn, different types of restorations are usually performed depending on the extent and location of the defect. If only a portion of the crown is simply missing, a simple resin filling, or a more aesthetically pleasing, long-lasting, and precise porcelain veneer or onlay restoration is usually chosen. If the defect results in the loss of a large portion of the crown, a full crown restoration is recommended to restore the form and function of the missing tooth tissue while protecting the remaining weak tooth tissue. When the wear is further aggravated, resulting in defects down to the root of the tooth or pulp exposure, then after root canal treatment, a post-core crown restoration is required to restore the missing tooth tissue by post-core restoration and to provide support for the crown restoration that follows, and finally a final layer of crown is added to provide overall protection and restoration. When the defect is so severe that the root of the tooth cannot be preserved, it can only be removed for implant restoration. Therefore, when there is wear and tear on the tooth, it is important to seek medical attention in a timely manner, and not to delay until the final treatment time cycle is long and costly.