Many orthopedic appliances have been developed to advance the mandible in growing Class II patients, including such removable devices as the Twin Block,* Elastic Open Activator (EOA), bionator, and Fra?nkel. Fixed-functional advancers include the Forsus,** Twin Force,*** Herbst,† Carriere Motion,*** PowerScope 2,‡ Jasper Jumper,‡ Jasper Vektor,†† XBOW,‡‡ and JVBarre Arc.§ The Invisalign§§ mandibular advancer now offers the potential of combining orthopedic therapy with esthetic treatment.