This appliance treats both tongue thrust and finger habit situations.  It is designed to correct the position of the tongue to improve swallowing patterns as well as discourage thumb or finger sucking.  The roller lingual to the anteriors reminds the patient to posture the tip of their tongue close to the incisive papilla so as to initiate proper swallowing. 

For patients who tend to suck their thumbs the roller is a good reminder to discourage the habit.