The Herbst is a two-piece fixed appliance used in the treatment of skeletal Class II malocclusions. In this design, the mandible is held forward with sliding tubes attached buccal to the upper six year molars and the lower first bicuspids. In this example, the Herbst is bonded into place. Retention may be accomplished through banding, bonding or a combination of both (depending upon the situation). The Herbst is suggested for patients who do not readily cooperate with removable functional appliance therapy.