Here's yet another fine gag you've gotten us into, Nurse! This wonderful dental device is designed to keep the mouth open by putting the curves of the "blades" between the teeth and the side of the mouth, so that the "scissors" section (which adjusts the opening and closing of the ratchet) are on on the side of the face...  you can use one on one side of the mouth or even more devious is another one on the other side! Opens a full 2" and that's really wide when you consider it's in the sides of the mouth!