How Proper Tongue Posture Influences Your Child's Jaw Growth and Facial Shape
Posted on 7/22/2025 by NC Pediatric Dentistry |
 Proper tongue posture plays a surprising role in how your child’s jaw grows and their face develops, and most parents have never heard of it. When the tongue rests in the right position against the roof of the mouth, it acts as a natural scaffold that guides the upper jaw to widen and grow forward. When it doesn’t, the effects can show up as crowded teeth, a narrow palate, and even changes to facial structure over time.
At NC Pediatric Dentistry, our team sees the impact of tongue posture during pediatric dental exams across North Carolina. This guide explains how tongue position connects to jaw growth, what disrupts it, and what parents can watch for.
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The Tongue’s Role in Jaw and Facial Growth
The human face doesn’t just grow on its own. It’s shaped by the forces acting on it during childhood, and the tongue is one of the most influential forces in the equation. When a child’s tongue rests naturally against the palate (the roof of the mouth), it applies gentle, constant pressure outward and forward. Over months and years, this pressure helps the upper jaw, or maxilla, expand to its full genetic potential.
This widening is important because the upper jaw forms the floor of the nasal cavity. A wider maxilla means more room for the nasal passages, which supports better nasal breathing. It also means more room for permanent teeth to come in without crowding. The relationship is elegant: good tongue posture supports jaw growth, which supports airway development, which supports better breathing, which reinforces proper tongue posture. It’s a positive cycle when everything is working together.
What Happens When the Tongue Rests Low
When the tongue sits on the floor of the mouth instead of against the palate, that supportive pressure disappears. Without it, the upper jaw tends to grow narrower and develop a higher arch. The lower jaw may also shift backward as the balance of forces changes.
The results can be visible over time. A child with chronically low tongue posture may develop a longer, narrower face. The cheekbones may appear less prominent, and the chin may recede slightly. Inside the mouth, the palate becomes vaulted and the dental arches narrow, leaving less room for permanent teeth and increasing the likelihood of crowding, crossbites, or other alignment issues that eventually require orthodontic treatment.
These changes don’t happen overnight. They develop gradually as the child grows, which is why they’re easy to miss. By the time crowding or alignment issues are obvious, the underlying growth pattern has been in motion for years.
Common Causes of Poor Tongue Posture
Several factors can prevent the tongue from resting in its ideal position.
Tongue ties are one of the most direct causes. When the lingual frenulum is too short or tight, the tongue physically cannot reach the palate. Even if the child tries to position the tongue correctly, the tethered tissue pulls it back down. Both anterior and posterior tongue ties can interfere with resting tongue posture.
Chronic mouth breathing is another common factor. When a child breathes through the mouth, the tongue drops to the floor of the mouth to allow airflow. Over time, this becomes the tongue’s default resting position. Allergies, enlarged adenoids, chronic congestion, and habitual patterns can all drive mouth breathing.
Prolonged pacifier use or thumb sucking beyond the toddler years can also alter tongue posture by training the tongue to rest low and forward rather than against the palate. The sucking motion reinforces a positioning pattern that works against proper jaw development.
In some cases, weak oral muscle tone is the issue. Children who had difficulty with feeding as infants, or who transitioned to soft foods very early without much chewing, may not develop the tongue and facial muscle strength needed to maintain proper resting posture.
Signs Parents Can Watch For
You don’t need special training to spot some of the early indicators. Watch your child when they’re relaxed, reading, or watching a show. Are their lips together and breathing through the nose? Or are the lips parted with the mouth slightly open?
Look at the tongue’s position when your child opens their mouth. Does it rest high against the roof, or does it sit flat on the bottom? A tongue that naturally stays low is a sign worth mentioning at your next dental visit.
Other clues include a narrow smile (where fewer teeth are visible), crowded or overlapping teeth coming in, a noticeable crossbite, chronic dry lips, or a pattern of snoring and mouth breathing at night. If your child has been diagnosed with a tongue tie or has a history of breastfeeding difficulty, tongue posture is especially worth evaluating.
How Treatment Can Help
The encouraging news is that because children’s jaws are still growing, early intervention can make a significant difference. Treatment depends on the underlying cause.
If a tongue tie is restricting movement, a frenectomy can free the tongue to reach the palate. After the release, myofunctional therapy exercises help retrain the tongue to rest in the correct position and build the muscle coordination needed to maintain it.
Orthodontic appliances like palatal expanders can help widen a narrow upper jaw, creating more room for the tongue and for permanent teeth. When combined with improved tongue posture, expansion tends to be more stable because the tongue continues to provide natural support after the appliance is removed.
For children whose low tongue posture is driven by mouth breathing, addressing the root cause of the breathing pattern is essential. That might involve allergy treatment, adenoid evaluation, or habit correction alongside dental care.
Our team works with families to identify what’s driving the issue and create a plan that addresses both the structural and functional components. Early evaluation gives your child the widest range of options.
Supporting Your Child’s Healthy Growth
Tongue posture may seem like a small detail, but its influence on your child’s jaw, airway, and facial development is real. If you’ve noticed signs of mouth breathing, crowding, or a tongue tie, the team at NC Pediatric Dentistry can evaluate your child and discuss options. Find a location near you across North Carolina to schedule a visit, or explore our homepage for more about our pediatric dental services.
Frequently Asked Questions
Where should my child’s tongue rest?
The ideal resting position is with the entire tongue gently pressed against the roof of the mouth (the palate), with the tip just behind the upper front teeth. The lips should be closed and breathing should happen through the nose.
Can a tongue tie affect jaw growth?
Yes. A tongue tie can prevent the tongue from reaching the palate, removing the gentle pressure that helps the upper jaw widen during growth. This can lead to a narrow palate, crowded teeth, and changes in facial development.
At what age should tongue posture be evaluated?
Tongue posture can be assessed as early as infancy, particularly if there are feeding concerns. For older children, a pediatric dental exam can identify signs of improper tongue posture, a narrow palate, or developing alignment issues. Earlier evaluation means more time to guide growth.
What is myofunctional therapy?
Myofunctional therapy is a series of exercises designed to retrain the muscles of the tongue, lips, and face. The goal is to establish proper tongue posture, improve swallowing patterns, and support nasal breathing. It’s often used after a frenectomy or alongside orthodontic treatment.
Can tongue posture be corrected in older children?
Yes, though earlier correction is easier because the jaw is still actively growing. Older children and teens can still benefit from myofunctional therapy, orthodontic expansion, and tongue tie release. The key is addressing both the structural restriction and the habit pattern together.
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