mouthstick

mouthstick /mouth″stik/ , a device that is gripped with the teeth and can be used to type, push buttons, turn pages, operate power wheelchairs, or modify environmental control units and other equipment. It is commonly used by individuals who have a high-level (C4 and up) tetraplegia. Compare chinstick.

Client using mouthstick for writing (Umphred et al, 2013)