A removable dental appliance fabricated of wire and plastic that is worn in the palate and used as a diagnostic or therapeutic aid in orthodontics or prosthodontics.

However if clutch-pedal pulsations are noticed or if gear shifting is hard and gears jump out of mesh then alignment should be checked. this requires a special alignment arbor and dial indicator .

The advantages of lingual appliance are delight, maximum anchorage and easy to open bite.