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The combined mouth gag and tongue depressor, shown in the accompanying illustrations, needs little further description. The gag never pinches the lip. The screw shown in Figure 2 touches the chin rest—as shown in Figure 4-and thus holds down the tongue depressor, which fits in the groove shown in Figure 2. There is always room for the tongue between the tooth rest and the tongue depressor, so that it is not necessary to draw the tongue to one side. As the screw is turned, the blade presses on the tongue and the chin rest presses on the chin. The two counterpressures —upward and forward—hold the tongue depressor firmly in place. The chin rest swings free so as to be easily adjusted to a receding or a protruding chin. The upper tooth rest should be covered with gauze or rubber tubing to protect the teeth and hold the mouth gag steady.
Roberts EL. A COMBINED MOUTH GAG AND TONGUE DEPRESSOR. JAMA. 1916;LXVI(14):1025. doi:10.1001/jama.1916.25810400004015e