After the teeth are aligned, the inward recession is performed according to the gap left in the patient’s teeth. If the patient needs a large degree of anterior retraction to achieve a better facial shape, a step-by-step method can be used to retract the tiger teeth on both sides first, then retract the anterior teeth 2-2 to achieve a greater degree of anterior retraction, while some implant support can be used to achieve a more powerful anterior retraction. The sliding method can be divided into the sliding method and the closing curve method. The sliding method is to use an elastic rubber band or a helical spring to tug on the arch wire and braces to perform the sliding method of internal retraction, while the closing curve method is to use the arch wire to bend to the closing curve to achieve the purpose of internal retraction of the anterior teeth.