Use the interval between tooth extraction to arrange crowded teeth. Patients with crowding degree II-III are more likely to have their teeth extracted.

Retracting the anterior teeth between tooth extraction can improve the protrusion of dental arch and improve the face shape. For example, some people have protruding lips. After tooth extraction, the protrusion of lips will become smaller and the face will become beautiful.

The occlusal relationship of the posterior teeth is adjusted by the extraction interval, so that the posterior teeth are staggered and the occlusal contact area is the largest, and the best chewing efficiency is achieved.

How to determine whether tooth extraction is needed in orthodontics

Because tooth extraction is a necessary step to correct some malocclusion, according to the type and degree of malocclusion, some malocclusion do not need tooth extraction at all, and some malocclusion cannot be cured without tooth extraction. When necessary, orthodontic tooth extraction can achieve ideal tooth arrangement effect. Orthodontists prefer diseased teeth and teeth that have the least impact on masticatory function, and some teeth have no impact on masticatory function after extraction. It promotes health, not hinders it. Compared with non-extractors, there is no significant difference in the impact on the health of teeth themselves. Under good surgical anesthesia, orthodontic tooth extraction can make the pain almost zero. The space after tooth extraction is finally closed by the appliance. For tooth extraction, it should be "it must be pulled out, but it can't be pulled out. Can it be pulled out through consultation?"-"Tooth extraction should generally be symmetrical, from the left side, from the right side and from the upper part, and special circumstances should be treated differently."