Tongue Thrusting. Tongue thrust refers to a condition in which the tongue presses too far forward in the mouth. When the tongue is in this position within the mouth, it often leads to various orthodontic issues, and may also be a sign of an orofacial myofunctional disorder. If tongue thrust has caused an open bite or other orthodontic issues, it is recommend to start myofunctional orthodontic treatment. This treatment involves the use of soft, silicone oral appliances, rather than traditional me