Abstract: An upright support is provided including a base at its lower end for stationary support relative to a stationary support surface. The upright includes a rear side rearwardly from which a collapsible chin rest projects at an elevation spaced slightly below the upper end of the upright and the front side of the upright mounts an upstanding blade therefrom deflectable both rearwardly and forwardly of the upright. The blade projects above the upper end of the upright and is engageable by the tongue of a patient whose chin is disposed on the chin rest rearward of the upright and an abutment member is slidable along the upright and the blade and is engageable by the latter with the abutment member serving as an adjustment member to vary the amount of forward thrust of a tongue on the blade required to forwardly deflect the blade upper end portion relative to the upright.