Lower jaw reduction device (MRD) includes that positioning mechanism makes a show front and back (AP) correction mandibular arch relative to maxillary. Positioning mechanism includes the top tooth plate and lower tooth plate of an extension of location structure, and complementary receiving formation passes through other upper tooth plate lower tooth plates. Receiving formation receives the locating structure for AP mandibular arches needed for the position of plate relative to each other relative to maxillary. The MRD also includes that setting element receives at least one plate of each molar region to occlusal surface is changed, and is achieved in the dentistry naturally-occurring of natural relative motion. Positioning mechanism is oriented to be located at preceding users masseter complexity.
