In the medical field, “minimally invasive” is a concept that minimizes the damage to the body during the treatment process, and the size of the incision is only one aspect of minimally invasive. Minimally invasive extractions usually involve two aspects, physical minimization and psychological minimization. The first is to remove the tooth with minimal damage to the organism by using minimally invasive extraction tools, whose main purpose is to preserve the alveolar bone to the greatest extent possible, minimize soft tissue damage, and have minimal postoperative side effects and fast recovery. Secondly, the operation of minimally invasive tooth extraction is performed without the use of hammering to increase the gap, so that the patient does not feel discomfort and is able to accept the subsequent treatment by the doctor. There are two methods of minimally invasive extraction, one is to remove the tooth by orthodontic traction, this method is time consuming, expensive and suitable for individual special cases. The other minimally invasive extraction technique is the application of a minimally invasive extraction knife and ultrasonic bone knife to perform the procedure, which is more widely applicable. When using the minimally invasive extraction knife, the sharp edge is first used to cut the gingival mucosa to achieve the purpose of separating the gingiva, inserting the extraction knife into the periodontal space in the direction of the long axis of the tooth, and cutting the periodontal ligament and cancellous bone by swinging and playing the characteristics of the sharp edge, so that the extraction knife can enter the gap between the root and the alveolar bone, at this time, the axial force can be applied to gently rotate the extraction knife to achieve the purpose of compressing the alveolar bone, and repeatedly Repeat the above operation to achieve the goal of tooth extraction. Ultrasonic bone knife is more convenient for bone removal, generating less heat and reducing the possibility of osteonecrosis, and the working end of the bone knife can be inserted into the deeper periodontal space with this method to increase the gap more gently, and the tooth can be easily extracted when the gap increase is completed. With the promotion of the concept of minimally invasive tooth extraction, more and more patients are now accepting minimally invasive tooth extraction. As society progresses, the concept of tooth extraction is gradually pushing forward, and it is believed that patients will get better and better medical services.