Abstract: There are disclosed two embodiments of a mandibular advancement or positioning device which uses elastic bands to pull the jaw forward. The appliance has an upper plastic tray conforming to the patient's upper teeth including maxillary dentition soft tissue and palate, and including a set of plastic retention hooks, one on the right and one on the left anterior buccal portion of the upper plastic base, with each extending outwardly from the tray. The appliance also has a lower plastic tray conforming to the patient's lower teeth including mandibular dentition and soft tissues, and including having a bite plane which opens the bite vertically. The lower tray also has a set of plastic retention hooks extending outwardly from the teeth, one on the right and one on the left of the posterior buccal portion of the lower plastic base.