Every orthodontist now knows that anterior open bite can be effectively treated by the posterior teeth intrusion using skeletal anchorage such as orthodontic mini-implants. Anterior open bite, which was difficult to treat without the patient's active cooperation, can now be treated even if the patient's cooperation is not good, and it is also possible to improve the long face caused by vertical overgrowth, which is often found in patients with anterior open bite.

The intrusion of the posterior teeth rotates the mandibular plane counterclockwise, reducing the anterior facial height and simultaneously moving the chin tip forward, which can have the effect of improving a class II skeletal relationship, so patients with long anterior facial height and anterior open bites with a class II skeletal pattern It can be said to be an excellent treatment that can improve several problems at once.

Patients with normal overbite but long anterior facial height and class II skeleton are also often seen. If vertical overbite is normal, intrusion of posterior teeth increases vertical overbite, making it difficult to use posterior intrusion to improve facial appearance. Recently, total arch intrusion(TAI) treatment, which can improve facial appearance regardless of the amount of overbite by the simultaneous intrusion of anterior and posterior teeth, has been introduced in various literature. I want to introduce a case in which an adolescent was treated through TAI and show how the TAI treatment of adolescents differs from that of adults and what the pros and cons are.