Conventional implants are usually placed 3 months after the extraction of the tooth, when the local bone is relatively stable. In contrast, immediate implant placement is performed at the same time as tooth extraction. Compared with the two, the latter has the following advantages: 1. Shortening the course of the disease, early restoration of missing teeth, restoration of aesthetic and occlusal functions, etc. 2. After tooth extraction, the alveolar bone will inevitably undergo alteration and resorption, with two-thirds of the bone resorption occurring in the first three months after tooth extraction, and the width of the remaining alveolar process is often only 50% of the original one year after extraction. This will greatly limit the choice of implant diameter, often leading to the selection of only smaller implants. 3. The height of the local alveolar bone will be reduced by 1-4 mm due to bone resorption after the extraction of the single tooth in different parts, which will limit the choice of the implant length, resulting in the selection of shorter implants only. 4. As you know, the thicker and longer the implant, the larger the area of integration with the bone, and to a certain extent, the stronger the implant. The influence of the two points 2 and 3 above is obvious. 5. The resorption of these bones will at the same time lead to a reduction of the local soft tissue. Especially in the aesthetic area of the anterior teeth, this affects to a great extent the results and satisfaction of the implant restoration. This sometimes leads to the need for simultaneous soft tissue grafting, or local reduction surgery, etc. 6. In recent years, domestic and international studies have found that immediate implantation and second-stage implantation have comparable implant success rates.