How does an orthodontic chin cup work?

An orthodontic chin cup is an extra oral appliance (outside of the mouth) that is used to help reduce or correct mandibular prognathism in adolescents. A chin cup is attached to elastic bands that usually fit over the crown of the head and put a moderate force on the lower jaw to help restrict its growth. Usually, the appliance is worn 12 or more hours per day for several months to a few years. The pressure from the chin cup restricts lower jaw growth. The upper jaw is allowed to grow at its normal rate and outpace the growth of the lower jaw. This helps realign the jaws and face into a more harmonious balance.