The tongue, lips, cheeks, and jaw muscles are active throughout the day as a child breathes, chews, swallows, speaks, and rests. Like other muscles in the body, they need coordination, endurance, and healthy movement patterns to function well.
These muscles do more than help a child eat or pronounce words. Their movements and resting positions create gentle, repeated forces around the teeth and growing jaws. When the muscles work together efficiently, they can support healthy oral posture, comfortable nasal breathing, coordinated swallowing, and balanced oral development.
One exercise or tongue position does not determine how a child’s face will develop. Genetics, airway anatomy, nasal health, oral habits, dental development, skeletal growth, and overall health all play important roles. Oral muscle function is one part of this larger developmental picture.
The tongue, lips, cheeks, and jaw muscles create repeated forces while a child breathes, chews, swallows, speaks, and rests. These patterns may influence oral posture, tooth position, and the environment in which the jaws develop. Persistent mouth breathing, tongue thrusting, or difficulty closing the lips may warrant a professional evaluation.
Why the Muscles of the Mouth Matter
Parents often begin thinking about jaw development after noticing crowded teeth or receiving a recommendation for an orthodontic evaluation. The teeth, however, are only one part of a connected system that includes the tongue, lips, cheeks, facial muscles, jaws, nasal passages, and upper airway.
Each part has an important role:
- The tongue helps move food, coordinate swallowing, produce speech sounds, and maintain oral posture.
- The lips help form a comfortable seal when the mouth is at rest.
- The cheeks help position food during chewing and create gentle pressure around the dental arches.
- The jaw muscles control movement and stability during eating, speaking, and resting.
- The nasal passages and upper airway allow a child to breathe during the day and while sleeping.
The mouth is part of both the digestive and respiratory systems, and its structures work together during chewing, swallowing, speech, and breathing. The Cleveland Clinic’s overview of mouth anatomy and function provides a helpful explanation of these connected roles.
A child swallows repeatedly throughout the day, breathes every minute, and maintains an oral resting posture for hours. Because these patterns occur so often, even gentle forces may become meaningful when they continue over long periods.
The American Academy of Pediatric Dentistry explains that oral habits should be evaluated according to factors such as their frequency, duration, and intensity. Its current guidance on developing dentition and occlusion in pediatric dentistry also discusses the importance of identifying functional habits, dental relationships, and developmental concerns early.
At MyoWay Centers for Kids, we explain that muscles help shape the functional environment in which bones grow. The tongue, lips, cheeks, oral habits, and breathing patterns do not control every aspect of facial development, but they are important parts of the system surrounding a child’s developing teeth and jaws.
How Oral Function Relates to Jaw Development
The upper and lower jaws develop in response to many influences, including genetics, nutrition, breathing, muscle activity, oral habits, health, and normal growth signals. Within the mouth, the tongue applies pressure from inside the dental arches while the lips and cheeks apply pressure from the outside.
Healthy oral function depends on balance. The tongue needs enough room to move and rest comfortably. The lips should be able to close without strain. A child should be able to breathe through the nose when the nasal airway is clear. Chewing and swallowing should occur without the tongue repeatedly pushing between the teeth.
When this balance is disrupted, the mouth may adapt.
For example, a child whose tongue consistently rests low may have a different pressure pattern around the upper dental arch than a child whose tongue rests comfortably within the palate. A child whose lips remain apart throughout much of the day may not receive the same gentle resting pressure from the lips. A forward tongue pattern during swallowing may also place repeated pressure against or between the teeth.
These patterns do not guarantee that a child will develop crowded teeth, a narrow palate, an open bite, or a particular jaw shape. They may, however, contribute to the conditions in which the teeth and jaws are developing.
Research has found associations between mouth breathing, oral habits, and several types of malocclusion, including open bite, crossbite, and changes in overjet. These studies identify relationships, but they do not establish that one habit is always the sole cause of a dental or skeletal change.
This is why oral function should be considered alongside structure. A dental or orthodontic examination can show what is happening with the teeth, bite, and jaws. A functional assessment considers how the child breathes, rests the tongue, closes the lips, chews, and swallows.
Families can learn more about mouth breathing, tongue thrust, oral restrictions, sleep concerns, and related patterns on the conditions treated by MyoWay Centers for Kids page.
Why Resting Oral Posture Is Important
Pediatric myofunctional therapy is sometimes described as exercise for the mouth. Exercises are part of the process, but they are not the entire goal. The larger purpose is to help a child develop healthier patterns that carry over into everyday life.
A child may perform a tongue exercise correctly for several minutes and then return to an open-mouth, low-tongue posture for the rest of the day. Lasting improvement depends on what the muscles do outside the therapy session.
Resting posture matters because it is maintained for much longer than any individual exercise. A functional oral resting pattern generally includes:
- Relaxed lips that can close without strain
- Comfortable nasal breathing when the nasal airway is clear
- A tongue position that does not push between the teeth
- A relaxed jaw without unnecessary tension
- Comfortable head and neck posture
Children should not be told to force the tongue against the roof of the mouth or keep the lips closed when they cannot breathe comfortably through the nose. Nasal obstruction, enlarged tonsils or adenoids, allergies, tongue mobility, dental relationships, and skeletal structure may affect what a child can do comfortably.
Parents should also be cautious about unsupported claims that a self-directed tongue position can dramatically reshape the face or replace orthodontic treatment. Facial growth involves bones, teeth, muscles, soft tissues, genetics, airway health, and development. A qualified professional can assess whether a concern is primarily muscular, dental, skeletal, airway-related, or a combination of factors.
Pediatric myofunctional therapy is different from following a random exercise routine online. It is structured around a child’s breathing ability, oral function, anatomy, age, and developmental needs. MyoWay Centers for Kids describes this approach in greater detail in Pediatric Myofunctional Therapy: More Than Just Mouth Exercises.
The Connection Between Mouth Breathing and Oral Posture
Mouth breathing can affect how the tongue, lips, and jaw muscles rest and function. It can also be a sign that breathing through the nose is difficult.
Possible contributors to mouth breathing include:
- Nasal congestion
- Seasonal or environmental allergies
- Enlarged tonsils or adenoids
- Nasal anatomy
- Respiratory illness
- Habitual open-mouth posture
- Reduced oral muscle coordination
- A combination of structural and functional factors
When a child opens the mouth to breathe, the tongue often moves lower in the mouth. If this pattern continues for months or years, the lower tongue position may become familiar. Some children continue using an open-mouth posture even after congestion or another airway concern improves because the pattern has become habitual.
A 2021 systematic review and meta-analysis found associations between mouth breathing and differences in facial skeletal development and dental alignment among children. Because much of the included research was observational, the findings cannot prove that mouth breathing alone caused every reported difference. Parents and professionals can review the study through PubMed’s analysis of mouth breathing and facial skeletal development.
A 2026 review also found a consistent association between mouth breathing and certain craniofacial differences in children. The authors noted that differences in study methods and reliance on observational evidence limit firm cause-and-effect conclusions. The findings are available in Mouth Breathing and Craniofacial Development in Children.
Additional research has examined the relationship between oral breathing, malocclusion, and lower-jaw development. A 2025 review described oral breathing as a risk factor relevant to malocclusion prognosis while also recognizing that the relationship is complex. The study can be found in Oral Breathing Effects on Malocclusions and Mandibular Development.
For parents, the practical distinction is between temporary and persistent mouth breathing. A child who opens the mouth during a cold is different from a child who regularly sleeps, studies, plays, or watches television with the mouth open.
Persistent mouth breathing may deserve further evaluation, particularly when it appears alongside:
- Snoring or noisy breathing
- Restless sleep
- Dry mouth or chapped lips
- Difficulty maintaining a comfortable lip seal
- Low tongue posture
- Teeth grinding
- Crowded teeth
- Daytime fatigue
- Difficulty concentrating
MyoWay Centers for Kids provides additional information about possible causes of pediatric mouth breathing and why identifying the underlying pattern matters.
How Oral Muscles Relate to the Airway
The jaws and airway are anatomically connected. The upper jaw contributes to structures surrounding the nasal cavity, while the size and position of the lower jaw affect the space available for the tongue.
Breathing is also influenced by nasal airflow, tonsil and adenoid size, sleep position, neuromuscular control, body composition, and other health factors. This is why oral exercises should not be presented as a cure for an obstructed airway or pediatric obstructive sleep apnea.
Children who snore regularly, gasp, pause while breathing, or appear to struggle for air during sleep need an appropriate medical evaluation. The American Academy of Pediatric Dentistry describes pediatric obstructive sleep apnea as repeated partial or complete upper-airway obstruction during sleep and supports screening and referral when concerning symptoms are present. Parents can review its policy on pediatric obstructive sleep apnea.
Research on myofunctional therapy for pediatric sleep-disordered breathing is still developing. Available reviews suggest that orofacial myofunctional therapy may have a supportive role for some children, but the evidence base remains limited and outcomes may be influenced by treatment duration, adherence, anatomy, and the child’s underlying diagnosis.
This is why pediatric myofunctional therapy is best considered one possible part of coordinated care rather than a replacement for medical, dental, orthodontic, or sleep-related treatment.
Some children may need support from several professionals, including:
- A pediatrician
- A pediatric dentist
- An orthodontist
- An ear, nose, and throat physician
- An allergist
- A sleep physician
- A speech-language pathologist
- A feeding specialist
- A pediatric myofunctional provider
The right plan depends on why the child is experiencing the pattern.
What Pediatric Myofunctional Therapy Helps Children Practice
Pediatric myofunctional therapy uses age-appropriate activities to improve oral muscle awareness, coordination, endurance, and everyday function. The program should reflect the child’s age, symptoms, anatomy, breathing ability, and clinical findings.
Depending on the child’s needs, therapy may support:
- A more functional tongue resting position
- Comfortable lip closure
- Nasal breathing when the airway is clear
- Coordinated chewing
- Efficient swallowing
- Better tongue and jaw movement
- Greater awareness of oral habits
The focus is not simply on making a muscle stronger. Some children have enough strength but need better coordination. Others need greater endurance. Some cannot comfortably maintain closed lips because nasal breathing is difficult. Others have dental, structural, or mobility limitations that should be addressed before functional training can progress.
Chewing is a good example of how several oral muscles work together. The tongue moves food from side to side, the cheeks keep food positioned over the teeth, the jaw creates controlled movement, and the lips help maintain stability. A child who avoids textures, chews with the mouth open, or takes an unusually long time to eat may need evaluation for feeding, sensory, dental, muscular, or structural concerns.
Swallowing is another coordinated activity. A child with a tongue thrust may move the tongue forward against or between the teeth during swallowing. This pattern may be associated with oral habits, airway adaptation, dental relationships, or muscle coordination. Therapy may help the child develop a more functional pattern after contributing factors have been identified.
The pediatric myofunctional therapy programs at MyoWay Centers for Kids may include guided muscle training, breathing support, oral-posture activities, parent education, at-home practice, and medical-grade myofunctional appliances when appropriate. Each program is selected according to the child’s developmental stage and individual needs.
When Exercises Alone Are Not Enough
Muscles cannot always overcome a structural or medical barrier. A child with restricted nasal airflow, significantly enlarged tonsils, limited tongue mobility, a narrow dental arch, or another anatomical concern may need care from additional professionals.
The reverse may also happen. A structural concern may be addressed, but the child may continue using the same muscular pattern. A child who has breathed through the mouth for years may continue sleeping with the lips apart after nasal airflow improves. The original obstruction may be reduced, but the familiar resting and breathing habits may remain.
Research on pediatric sleep-disordered breathing has noted that symptoms can persist or recur after tonsil and adenoid surgery in some children, which supports the importance of long-term follow-up and individualized assessment.
Coordinated care allows structure and function to be addressed together. Medical treatment may improve airflow. Orthodontic care may address dental alignment or skeletal relationships. Pediatric myofunctional therapy may help the child develop more functional breathing, resting, chewing, or swallowing patterns within the improved environment.
No single approach is right for every child. An evaluation can help determine whether the concern is primarily functional, structural, medical, habitual, or a combination of several factors.
Signs That May Warrant an Evaluation
Parents do not need to diagnose oral muscle dysfunction at home. Observing everyday patterns is enough to begin a useful conversation with a qualified provider.
An evaluation may be helpful when a child regularly:
- Breathes through the mouth during the day or night
- Sleeps with the lips apart
- Snores or breathes noisily
- Grinds the teeth during sleep
- Drools heavily at night
- Struggles to keep the lips closed comfortably
- Pushes the tongue forward when swallowing
- Chews with the mouth open
- Avoids certain food textures
- Has crowded teeth alongside breathing concerns
- Wakes tired despite spending enough time in bed
- Continues mouth breathing after airway treatment
One sign does not confirm that a child needs pediatric myofunctional therapy. Several patterns that continue over time are generally more meaningful than an occasional behavior.
Parents should also avoid repeatedly telling a child to close the mouth without understanding why it remains open. A child may be compensating for congestion or restricted airflow. Correcting the visible habit without identifying the cause may create frustration without improving function.
Seek prompt medical attention if a child appears to stop breathing, gasps, chokes, turns blue, or struggles significantly for air during sleep.
Supporting Healthy Growth Through Better Function
The muscles of the mouth participate in breathing, chewing, swallowing, speaking, sleeping, and oral posture. Their everyday patterns help create the environment in which a child’s teeth and jaws develop.
Healthy oral function does not come from forcing a tongue position or completing random exercises. It develops through coordinated movement, a comfortable airway, appropriate structure, consistent practice, and support that reflects the child’s individual needs.
When parents notice mouth breathing, low tongue posture, restless sleep, chewing difficulty, tongue thrusting, or related dental concerns, an evaluation can help clarify what is happening. It can also identify whether the child may benefit from pediatric myofunctional therapy, medical assessment, dental care, orthodontic evaluation, feeding support, or coordinated treatment.
To learn whether your child’s breathing, oral posture, or muscle function may benefit from further evaluation, schedule a free consultation with MyoWay Centers for Kids.
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Frequently Asked Questions
Can mouth muscles affect a child’s jaw development?
Oral muscles create repeated forces around the teeth and dental arches. These forces may influence oral posture and tooth position during growth. Jaw development also depends on genetics, skeletal growth, airway health, dental relationships, nutrition, and oral habits.
Is pediatric myofunctional therapy just mouth exercise?
No. Exercises are one part of therapy. The broader goal is to improve how the tongue, lips, cheeks, and jaw function during breathing, chewing, swallowing, speaking, and resting.
Can tongue posture change a child’s face?
Tongue posture may contribute to the functional environment around the teeth and jaws, but it does not determine facial growth by itself. Genetics, bone structure, airway health, dental development, and other factors also matter.
Why does my child rest with an open mouth?
Open-mouth posture may be related to congestion, allergies, enlarged tonsils or adenoids, nasal anatomy, oral habits, reduced muscle coordination, or difficulty maintaining a comfortable lip seal. An evaluation can help identify possible contributing factors.
Can pediatric myofunctional therapy help with mouth breathing?
Pediatric myofunctional therapy may help a child develop healthier oral posture and breathing habits when muscle function is part of the concern. A child with nasal obstruction or another airway issue may also need medical assessment and treatment.
Can mouth exercises widen a child’s jaw?
Exercises may improve muscle coordination, endurance, and oral posture, but they should not be presented as a guaranteed way to widen the jaw. Structural development concerns may require evaluation by a dentist or orthodontist.
Does pediatric myofunctional therapy replace orthodontic treatment?
No. Pediatric myofunctional therapy focuses on oral muscle function and habits. Orthodontics focuses on tooth position, bite relationships, and certain skeletal concerns. Some children may benefit from coordinated care involving both.
When should my child have a myofunctional evaluation?
An evaluation may be helpful when mouth breathing, snoring, open-mouth sleep, tongue thrusting, poor lip seal, chewing difficulty, or oral-posture concerns continue over time or occur alongside dental and sleep concerns.
