1. When controlling #13#23 mesial movement, the root was not controlled, resulting in the mesial inclination of the crown. X-ray showed that the root of the tooth was longer, so it was more difficult to control the root.

2. Through the comparison of preoperative and postoperative photos, the effect of aligning dentition and anterior tooth adduction is obvious.

3. The effect of distal movement of posterior teeth in this case reached the expectation and was able to return the molar relationship to neutral relationship.

1. 12 #, 44 # missing, 22 # deformed, 23 # and 24 # misplaced.

2. Upper and lower anterior teeth are crowded.

3. Shallow overburden, shallow overburden, partial anterior teeth opposite edge.

1. Align the upper and lower dentition with the extraction space.

2. Adjust the molar to neutral relationship.

3. Improve the midline relationship.

1. Remove 24#, 34# teeth, align the dentition with the extraction space, and retract the front teeth.

2. 22# too small, it's best to reserve space during the correction process. After the correction, crown repair shall be performed to restore the tooth shape.

3. Adjust and grind 13# tooth tip to make its shape closer to lateral incisor.

4. Maintain treatment to prevent recurrence.