A tongue thrust and a low, forward rest
position of the tongue tip often occur together. When a tongue thrust
is observed with a malocclusion, it’s commonly presumed that the tongue
thrust caused the teeth to become out of alignment. But where the tongue tip resides at rest is also an important factor. An abnormal tongue rest position can result in dental changes over time. In the same way that a slight and continuous force is what orthodontists and dentists use to move teeth, continuous and prolonged thrusting and sucking habits can also cause a change in the shape of the palate, the dental arches, and the position of teeth.
Positioning the teeth into correct position, but without correcting disfunctional habits of the orofacial muscles and rest position of the tongue, is likely to result in relapse and recurrence of malocclusion.
When the tongue rests in a normal position and functions normally during eating, swallowing and speaking, the teeth can then be placed in a normal position and should remain stable, without future relapse.