The Herbst Appliance is used in the treatment of jaw discrepancy (i.e., overjet, when the upper front jaw protrudes over the lower front jaw). In growing patients, it allows lower jaw growth. In older patients, it retrains the action of certain muscles. The average treatment time is approximately 9 months to 1 year, during which time the lower jaw is advanced initially about 3-4mm, and then incrementally, until the desired resting position is achieved.
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