Two front teeth are generally not serious. If the patient only has malocclusion in the anterior teeth area, he can wear padded appliance, raise the posterior teeth and open the occlusion to form normal coverage. If the patient's dental arch is narrowed with posterior teeth, a spiral arch expander can be placed in the base of the appliance to open the middle palatal suture, so as to promote the posterior teeth to move to the labial side and increase the mandibular width. When the patient's mandible is overdeveloped, chin pocket can be combined to inhibit mandibular protrusion and accelerate the full development of jaw.

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