After tooth extraction, a series of inflammatory reactions and alterations of the alveolar bone are initiated, the soft tissue shrinks, and the new bone in the extraction socket does not reach the level of the original alveolar ridge (as shown in the figure). The width of the alveolar ridge is significantly reduced, the bone height and density are reduced, and the damage to the labial and buccal bone plates is particularly severe, which often results in insufficient bone volume for implant placement, making it difficult to guarantee the initial stability and long-term success of the implant restoration, and poor aesthetic results of the fixed restoration. Therefore, the preservation of the height and width of the alveolar ridge and the surrounding soft tissues after tooth extraction is of great importance for the implantation or restoration of the missing tooth site. The purpose of the extraction site preservation is to effectively preserve the height and width of the remaining alveolar ridge and the corresponding soft tissue volume after extraction to provide sufficient bone volume and aesthetic basis for subsequent implant surgery and restoration. Guided bone regeneration (GBR) is a procedure that uses the barrier effect of the membrane to promote the preferential migration and growth of osteogenic cells to the bone defect area for the purpose of bone regeneration and restoration. At present, GBR technique is an ideal technique for bone augmentation and has become a routine treatment for immediate implantation and simultaneous repair of various bone defects, and has achieved good clinical results. The GBR technique has been used to obtain a good bone height and width after surgery and to meet the requirements of phase II implant placement and later aesthetic restoration. At present, GBR technique has become a routine treatment for immediate implant simultaneous restoration of bone defects, but its application in the same period of tooth extraction has not been widely carried out. In cases where the bone loss is severe after extraction of the affected tooth or teeth located in the esthetic area, and the conventional treatment of the extraction wound may lead to severe bone loss in the alveolar ridge and the implant cannot obtain initial stability during immediate implant placement, the routine application of GBR technique during the same period of extraction provides a treatment idea and method to improve the clinical results of implant placement and esthetic restoration.