Abstract: The appliance includes a first member and a second member, with the second member being free of a permanent connection with the first member. The first member has an abutment/obstruction element including an abutment surface and an obstruction surface, and a mounting element for mounting the first member to a tooth on one of the maxillary or mandibular jaws. The second member has a buccally extending projection and a mounting member for mounting the second member to a tooth on the other one of the maxillary or mandibular jaws. The first and second members are mounted on the teeth so as to place the obstruction surface in generally vertical alignment with the buccally extending projection when the mandibular jaw is in its uncorrected position. This orientation causes the obstruction surface and buccally extending projection to strike one another when the patient attempts to close the mandibular and maxillary jaws with the mandibular jaw in its uncorrected position.