An apparatus for use in treating a breathing condition includes a first dental arch, a second dental arch, two bodies coupled to the first dental arch, and two receivers coupled to the second dental arch. The first dental arch is configured to receive at least some of a wearers teeth. The second dental arch is configured to receive at least some of a wearers teeth. Each body includes a front stop, a rear stop, a threaded member, and a hook. The threaded member is configured to be coupled between the front stop and rear stop of the body and configured to rotate relative to the body. The hook comprises a threaded passage configured to engage the threaded member, and an arm configured to engage a second dental arch. The hook is configured to travel between the front stop and rear stop of the body in response to rotational adjustment of the threaded member to adjust the lower dental arch relative to the upper dental arch. Each receiver comprises a first rail configured to engage the arm of the hook of a respective one of the two bodies. The first rail is disposed exterior to an internal area defined by a span of the second dental arch. The two receivers are entirely disposed, with respect to each other, on opposite sides of a plane bisecting left and right halves of the second dental arch.
