Tongue Thrust in Children: Causes, Signs, and Treatment

If you have noticed your child's tongue pushing against their front teeth when they swallow, or if their front teeth do not seem to meet properly, you may be dealing with a condition called tongue thrust.

Tongue thrust is one of the more common oral habit patterns seen in children, and it is closely tied to how the jaw develops, how teeth align, and even how a child speaks. The good news is that it is highly treatable, especially when caught early.

What Is Tongue Thrust

In a normal swallow, the tip of the tongue presses against the roof of the mouth, just behind the front teeth. In tongue thrust — also called reverse swallow — the tongue pushes forward against or between the front teeth instead.

This pattern is normal in infants. Babies naturally thrust their tongue forward when breastfeeding or bottle feeding. The issue is when this pattern persists beyond the toddler years.

When tongue thrust continues past age four to six, the pressure from the tongue pushing against the teeth can cause the front teeth to shift forward. Over time, this can create an open bite, where the upper and lower front teeth do not make contact when the mouth is closed.

What Causes Tongue Thrust

Tongue thrust usually develops because of something that makes nasal breathing difficult or because of longstanding oral habits.

Airway Obstruction

When a child cannot easily breathe through their nose — due to enlarged tonsils, adenoids, or chronic allergies — they naturally switch to mouth breathing. Mouth breathing changes the resting position of the tongue. Instead of sitting against the roof of the mouth, the tongue drops down and forward, which can lead to a thrusting pattern during swallowing.

Prolonged Oral Habits

Extended thumb sucking, finger sucking, or pacifier use beyond age three or four can train the tongue to sit forward in the mouth. The same goes for prolonged bottle feeding or sippy cup use. Each of these habits reinforces a forward tongue position that can persist into early childhood.

Low Tongue Resting Posture

Some children naturally rest with their tongue on the floor of the mouth rather than against the palate. This low resting posture can make it harder to develop a correct swallowing pattern.

Signs of Tongue Thrust in Children

Tongue thrust can show up in several ways. Here is what to watch for:

Swallowing Signs

• The tongue visibly pushes forward or sticks out during swallowing
• The lips are not sealed when swallowing
• Food or liquid may spill out of the front of the mouth while eating

Dental Signs

• An open bite where the front teeth do not touch when the back teeth are closed
• Protruding upper front teeth
• Spaces between the front teeth that seem to be widening over time

Speech Signs

• A lisp, especially on "s" and "z" sounds
• Difficulty with sounds like "t", "d", "n", and "l"
• Speech that sounds imprecise or unclear

Other Signs

• Open mouth posture when resting
• Drooling beyond the typical age
• Picky eating or difficulty with certain textures
• Mouth breathing during the day or night

How Tongue Thrust Affects Dental Development

The tongue is a surprisingly strong muscle. Every time a child swallows — which happens about 500 to 1,000 times a day — the tongue applies force to the teeth and surrounding structures. When that force is directed forward against the front teeth, it can gradually shift them out of alignment.

Over time, the effects can include:

• An open bite that may require orthodontic treatment to close
• A narrow upper jaw if the tongue does not rest against the palate during growth
• Crooked teeth or crowding that becomes more noticeable as permanent teeth come in
• Relapse after orthodontic treatment if the tongue thrust pattern is not addressed

This is why tongue thrust is not just a swallowing issue — it is a dental development issue that can affect how the teeth and jaws grow.

Treatment Options

Myofunctional Therapy

Myofunctional therapy is the main approach used to correct tongue thrust. It involves a series of simple exercises that retrain the tongue and facial muscles. The goals are:

• Teach the tongue to rest against the roof of the mouth
• Establish a correct swallowing pattern where the tongue pushes upward, not forward
• Strengthen the lip seal so the mouth stays closed at rest
• Retrain the breathing pattern toward nasal breathing

The exercises are practiced at home for a few minutes each day. Progress is monitored during follow-up visits, where the exercises are adjusted as needed. Most children respond well with consistent practice over several months.

Removable Appliances

In some cases, a removable appliance may be used alongside myofunctional therapy. This is typically worn at night and includes features that help guide the tongue into the correct resting position. The appliance works together with the exercises, not as a replacement.

Working with Other Specialists

If tongue thrust is related to an airway issue like enlarged tonsils or allergies, your dentist may recommend a referral to an ear, nose, and throat (ENT) specialist or an allergist. If speech difficulties are a concern, speech therapy may be used alongside myofunctional therapy to address articulation.

When to Seek Help

The ideal time to assess tongue thrust is around age six to seven, when permanent front teeth are beginning to come in and the pattern is clearer to identify. However, if tongue thrust is already affecting feeding, speech, or tooth position, earlier assessment can be helpful.

At iSmile Dental Clinic, every pediatric check-up includes a basic myofunctional screening. The dentist will look at how your child swallows, where their tongue rests, and how they breathe. If tongue thrust is identified, the dentist will explain what treatment options are available and how they fit into your child's overall development.

Taking the Next Step

Tongue thrust is a common and treatable condition. With early recognition and the right approach, most children can develop a correct swallowing pattern that supports healthy dental development and clear speech.

For more information, visit our myofunctional orthodontics page or explore our children's dental services.