A dental appliance for adjusting the positioning of the lower jaw of a patient with respect to the upper jaw thereof, including an upper tray and a lower tray intended to fit the teeth of the upper and lower jaw, respectively, wherein the trays are connected to one another by means of a spring wire being substantially in the shape of a U, the spring wire arranged in an occlusal position between the trays without protruding into the vestibular regions of the mouth of the patient, wherein each end of the spring wire is mounted pivotably on a first of the lower and upper trays about an axis of pivoting arranged parallel to the occlusal plane of contact of the teeth of the lower and upper jaws, wherein the spring wire is pivotably and removably connected to a second of the lower and upper trays by means of a hook removably or non-removably fixed to the second tray, the hook being positioned in such a way that it produces an offset between the first and second trays in at least a direction perpendicular to the axis of pivoting of the spring wire with respect to the second tray.
