Disease analysis: (1) Not all orthodontic patients need to have their teeth extracted, but about 50% of them have their teeth extracted now. (2) Tooth extraction depends on the needs of orthodontic treatment. Patients with severely crowded teeth and protruding teeth generally need tooth extraction treatment. Tooth extraction can make the teeth arrange neatly and reduce the degree of tooth protrusion. After tooth extraction treatment, the remaining teeth will play a better role and make the patient's face more beautiful. (3) Tooth extraction will not cause tooth loosening. The space left after tooth extraction will be occupied by the remaining teeth, and there will be no gaps between the teeth. On the whole, the teeth support each other and play a better role without loosening. (4) The whole tooth will not loosen the teeth. The force exerted by regular orthodontic treatment on teeth is very mild and will not cause damage to teeth and periodontal tissue. Suggestion: