An oral appliance includes an upper arched frame, an upper moldable tray coupled to the upper arched frame, a lower arched frame, and a lower moldable tray coupled to the lower arched frame. The upper arched frame includes a first tab and a second tab being positioned, with respect to each other, on opposite sides of a plane substantially bisecting the upper arched frame. The lower arched frame includes a third tab extending from the lower arched frame.