An apparatus for treating a breathing condition includes a body, a threaded member,a hook, and a receiver. The body comprises a front stop, rear stop, and a guide extendingbetween the stops The threaded member couples between the stops and rotates relativeto the body. The hook couples to the guide, comprises a threaded passage and anarm that engages a lower arch, and travels in a forward direction along the guideto adjust the position of the lower arch. The receiver couples to the lower archand compnses a shelf that engages the arm of the hook. The apparatus may includea post that couples the apparatus to another device In certain embodiments, aremovable receiver is removably positioned within a recess in a posterior surfaceof a lower arch and is engaged by a connector of an upper arch to define the relativepositions of the arches.
