When I took over this patient, she had been treated at a small local clinic for more than six months, and she was distressed to tell me that her teeth were still buck teeth compared to six months ago. The clinic doctor extracted her 4 first bicuspids, and the extraction itself was right for her treatment plan, but the problem was that the doctor did not control the support resistance well enough, and the posterior teeth lost a lot of support resistance, at this time there was not much space left in the maxillary dentition, and the mandibular space was basically closed, resulting in no improvement in facial shape even though the patient had 4 teeth extracted, and the valuable space provided by 4 teeth was wasted! Here to popularize the most common concept of “support” in orthodontic treatment, the so-called support is a structure that can resist the reaction force of the orthodontic force, orthodontic treatment is commonly used as a support to pull the front teeth to the far middle, usually, we hope that the support of the back teeth do not move, as far as possible, the front teeth to move back, so as to achieve the internal intake of the front teeth, to improve the lip protrusion. In this way, we can achieve the purpose of internalizing the anterior teeth and improving the lip protrusion. Therefore, in orthodontic treatment, the doctor needs to carry out effective support control by various means, so as to avoid the prevention of unfavorable tooth movement. Therefore, it was necessary to retrieve the lost posterior teeth as soon as possible, and the only effective way to do this was to place two 2*10mm implant nails between the maxillary 67 under local anesthesia. I used the implant nails to support the inward retraction of the anterior teeth, and the patient’s facial shape improved significantly in the end.