Abstract: The oral machine controller is an apparatus for controlling operations of a machine by jaw and tongue movement of an operator. Upper and lower dentition grips include thermoplastic members which are conformed to tooth shape to cling thereto. A lightweight control unit in a housing includes a straight potentiometer which generates a controllably variable voltage signal to control a speed or intensity function of the machine. One dentition grip is attached to the control unit housing by a first control arm and the other to a second control arm which is attached to a moveable contact on the potentiometer for changing its position and controlling the speed or intensity function of the machine. A tongue-actuated microswitch is provided for additional control of machine functions.