I am sometimes asked about tongue thrust–what it is, how it impacts speech, and what to do about it.
All babies have a tongue thrust or reverse swallow. When the baby swallows, his tongue pushes forward toward his gums or front teeth, if he has them. Think about feeding a baby pureed food. The baby’s tongue pushes forward, pushing some of the food back out of his mouth. The adult scoops the food off his lips and face with the spoon and puts it back in his mouth and the cycle continues. As babies mature, they learn, not only to keep their lips closed when they swallow, but to effectively move the food back toward the throat with a more mature swallow.
In the mature swallow, the tongue tip is held on the alveolar (gum) ridge behind the top front teeth and the tongue efficiently moves the food backward with a rolling motion. Children should have a normal, adult swallow by the time they are 7.
Sometimes, however, a child continues to tongue thrust or reverse swallow. When this occurs, generally his teeth are slightly separated, the tongue presses forward against or between the front teeth, and the lips are tightly closed to prevent the tongue from protruding. Many children who have a tongue thrust are mouth breathers, often due to either allergies or enlarged tonsils/ adenoids, causing the tongue to sit between or against the front teeth at rest. Then, when they swallow, the tongue pushes forward against the teeth.
How can I know if my child has a tongue thrust?
-The most obvious answer is to have him evaluated by a speech pathologist. But you may be able to diagnose this yourself.
-Is he a mouth breather? Does he keep his tongue between his front teeth when at rest? These are signs that he likely has a tongue thrust.
-Have him take a sip of water and observe his swallow. Try to pry his lips apart during the swallow. There should not be any forward movement of the tongue. Generally, children with a tongue thrust are unable to swallow with their lips parted.
What are the results of a tongue thrust?
-The tongue is a very strong muscle. If it is pressing against the front teeth during thousands of swallows a day, it will most likely cause the teeth to protrude. If this happens, the tongue thrust must be corrected before orthodontic work is done or the the teeth will quickly move out of place again.
-The strong habit of tongue protrusion often affects the speech patterns. The most typical speech errors seen with a tongue thrust are a “th” for “s” or “z” substitution. In more severe cases, all of the tongue tip sounds (t, d, n, ch, sh, j) can be affected. It can be difficult to correct these speech errors when there is an uncorrected tongue thrust.
What should be done?
-If your child is under seven, give the issue more time. If your child is seven or older, find a speech pathologist who is experienced in tongue thrust therapy. Be prepared to supervise your child with tongue exercises one or more times a day. It will take a lot of practice to change this ingrained habit.
-If your child is a mouth breather, try to find the cause. If he cannot comfortably breathe through his nose due to allergies or enlarged tonsils and adenoids, this problem needs to be corrected first.
-Encourage your child to keep his lips and back teeth together and his tongue at rest on the upper gum ridge. Having him hold a Tic-Tac or orthodontic rubber band in place with his tongue for 10-20 minutes a day can encourage this habit.
As with all speech and language issues, I encourage you to be alert to your child’s development and to seek professional advice and take action when necessary.