If it is caused by third molar obstruction, the third molar can be extracted and orthodontic treatment can be carried out. If it is caused by mandibular second premolar or maxillary cuspid obstruction, try to retain the teeth and orthodontic treatment can be carried out as follows. 1. Third molar obstruction: For the third molar that causes crowding, its retention value is not high, it can be extracted and then orthodontic treatment can be carried out to align the teeth. If the gap is still insufficient, the four premolar teeth can be extracted and then aligned and leveled. 2. Obstructed mandibular second premolar or maxillary cusp: the obstructed second premolar or cusp should be preserved as much as possible, four first premolar can be extracted to open a gap for the eruption of the obstructed teeth, which can be erupted naturally or assisted by gingival cutting and traction, and then the teeth will be lined up and leveled out to establish a normal occlusal relationship after they are fully erupted. It is recommended to go to a regular medical institution to receive professional treatment.