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 the immediate denture, the timing of each denture is related to the remaining roots, crowns, intact teeth, hard and soft tissues in the mouth, etc. 1. Immediate denture is completed before the extraction and is worn 30 minutes after the extraction to protect the extraction wound and prevent the adjacent teeth from tilting towards the gap. 2.Activated denture Generally, about 3 months after the last tooth extraction (the time for residual roots and remaining roots should be changed according to the specific situation), the prerequisite is that all other conditions in the mouth meet the requirements for an activated denture. 3.Fixed denture Generally, it is also about 3 months after the last extraction (residual root, remaining root, etc. should be changed according to the specific situation), and the prerequisite is that other conditions in the oral cavity meet the requirements for fixed denture. 4.Full denture is also about 3 months after the last extraction (the time for residual roots, remaining roots, etc. should be changed according to the specific situation), the prerequisite is that the other conditions in the mouth meet the requirements for full denture. 5.Implant denture Phase I surgery, 4-6 months after the extraction of the corresponding dental implants, 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.