The term “veneer” is “denture” and can be divided into immediate, removable, fixed, complete, and implant denture depending on the timing of the denture. Except for immediate denture, the timing of each type of denture is related to many factors such as remaining roots, crowns, intact teeth, hard and soft tissues in the oral cavity. 1. Immediate denture is processed before the extraction and worn 30 minutes after the extraction, which has the effect of protecting the extraction wound and preventing the adjacent teeth from tilting toward the gap. 2.Activated denture, generally about 3 months after the last extraction (the time will be changed according to the specific situation), the prerequisite is that the other conditions in the mouth meet the requirements of the activated denture. 3.Fixed denture, generally is also in the last extraction about 3 months (residual roots, remaining roots, etc. should be changed according to the specific situation), the prerequisite is that other conditions in the oral cavity meet the requirements of fixed denture. 4.Full denture, also about 3 months after the last extraction (residual roots, remaining roots, etc. should be changed according to the specific situation), the prerequisite is that all other conditions in the mouth meet the requirements for a full denture. 5. For the first stage of implant denture surgery, 4-6 months after the extraction of the corresponding dental implant, the alveolar bone in the extraction wound must be completely healed, and other local and systemic conditions must also meet the requirements of the implant denture, and the subsequent surgery also requires the corresponding time and conditions.