Proper tongue posture means resting the tongue gently against the roof of the mouth, with the lips sealed and the teeth lightly together or nearly touching. This sounds like a minor detail of anatomy, but the tongue is a powerful muscular organ that exerts constant low-grade force on the structures around it, and where it sits at rest shapes everything from dental alignment to airway patency. The concept has attracted enormous attention online, yet the underlying science is more nuanced and, in places, more uncertain than the social media version suggests.
What “Correct” Resting Position Looks Like
When clinicians describe ideal tongue posture, they mean the broad body of the tongue resting against the hard palate, with the tip sitting just behind the upper front teeth without pressing on them. The lips stay closed, and the teeth are either lightly in contact or separated by only a millimeter or two. This creates a sealed oral compartment in which a slight negative pressure helps hold the tongue in place, even during sleep. Researchers studying jaw development have described this posture as holding the teeth lightly together with the tongue positioned against the palate and the lips sealed, and clinical work suggests it results in an adequately developed jaw.1BioScience. The Jaw Epidemic: Recognition, Origins, Cures, and Prevention
A low resting tongue position, by contrast, means the tongue sits on the floor of the mouth or drops forward so that its tip presses behind or between the lower front teeth. This is not just a posture variant; it is consistently associated with measurable dental and skeletal differences. A systematic review of lingual resting posture found that a low or forward tongue position was linked to anterior open bite, crossbite, and articulation errors.2Communication Disorders Quarterly. Still Tongue, Silent Cues: A Systematic Review of Lingual Resting Posture In orthodontic research, clinicians measure the gap between the tongue’s surface and the palate on lateral X-rays; a wider gap signals the tongue is sitting lower.3PubMed Central. The assessment of resting tongue posture in different sagittal skeletal patterns
How Tongue Position Shapes the Jaw and Teeth
The tongue’s influence on facial structure is sometimes called its “morphogenetic” role, and it starts early. During childhood, the upper jaw (maxilla) is not a single fused bone but a set of growing pieces that respond to the forces acting on them. When the tongue rests against the palate, it provides steady outward pressure that encourages the upper dental arch to widen and develop fully. When it rests low, that support disappears, and the arch tends to narrow and lengthen instead.4PubMed Central. The Influence of the Tongue on the Development of Dental Malocclusion
This is not purely theoretical. One long-term orthodontic case report documented what happens when a corrected bite relapses because tongue posture deteriorates. After treatment, the patient’s tongue gradually dropped to a lower position, and the tongue-to-palate distance roughly tripled compared to where it had been post-treatment. The anterior open bite returned, and the authors concluded that the low tongue posture was likely the primary cause of relapse.5The Korean Journal of Orthodontics. Treatment and retention of relapsed anterior open-bite with low tongue posture and tongue-tie: A 10-year follow-up The case underscores a frustration familiar to orthodontists: you can move teeth into the right place with braces, but if the tongue keeps pushing them in the wrong direction at rest, the teeth tend to drift back.
Appliances designed to redirect tongue pressure bear this out. In a study using a crib appliance (a small metal framework behind the upper teeth), researchers tracked tongue pressures over 12 months. After the appliance was placed, the tongue adapted: resting pressure on the incisors dropped and stayed lower than baseline, and the open bite closed significantly. The tongue essentially learned to avoid the barrier and settled into a new position.6PubMed Central. Tongue pressure changes before, during and after crib appliance therapy
Tongue Thrust and the Swallowing Connection
Tongue thrust is a pattern in which the tongue pushes forward against or between the teeth during swallowing instead of pressing upward against the palate. It is essentially a persistence of the swallowing pattern used in infancy, and when it carries over into later childhood and adulthood, it creates problems. The repeated forward force can push the upper front teeth outward and contribute to open bite, breathing difficulties, and speech issues.7PubMed Central. Orofacial Myofunctional Therapy in Tongue Thrust Habit: A Narrative Review
A study of nearly 200 schoolchildren found that about 5% were tongue thrusters, and those children had significantly greater overjet, meaning their upper teeth protruded further forward relative to the lower teeth, compared to children who swallowed normally.8PubMed Central. Effect of Tongue Thrust Swallowing on Position of Anterior Teeth The relationship between swallowing and resting posture is not always straightforward, though. Some children thrust during swallowing but rest the tongue in a normal position, while others have a low resting posture and a normal swallow. The combination of both, a low resting position and a thrusting swallow, is generally considered the most problematic for dental development.
This is worth knowing because well-meaning parents sometimes worry after watching a child stick out their tongue during meals. Occasional forward tongue movement during eating is normal, especially in young children still learning to manage solid food. Tongue thrust becomes a clinical concern when the pattern persists past the mixed-dentition stage and the teeth begin to visibly shift.
Breathing, Airway, and the Nose-Mouth Loop
Tongue posture and breathing are tightly linked, and the relationship runs in both directions. When the tongue sits against the palate and the mouth stays closed, air flows through the nose, which warms, humidifies, and filters it. When the tongue drops low and the mouth falls open, nasal airflow decreases, and the person defaults to mouth breathing. Over time, chronic mouth breathing itself reinforces the low tongue position, because you cannot rest the tongue on the palate and breathe through an open mouth at the same time.
A study using computational fluid dynamics modeling tested what happened when children with low tongue posture underwent orofacial myofunctional therapy. After treatment, the group that received therapy showed markedly lower nasal airway pressure drop compared to the untreated group, meaning air moved through the nose more easily. The therapy group also had a significantly higher rate of improvement in low tongue posture, about three-quarters of treated children versus roughly half of untreated ones.9PubMed Central. Low Tongue Posture Improvement Effect of Orofacial Myofunctional Therapy Comprehensive Study of Nasal Ventilation Condition Using Computational Fluid Dynamics and Dental Arch Morphology The finding suggests that improving tongue posture can have measurable downstream effects on how well you breathe through your nose.
The tongue’s relationship to the airway also becomes relevant during sleep. When you lie down and muscle tone decreases, a low-posture tongue is more likely to fall backward and partially block the airway. This is one of the mechanisms behind obstructive sleep apnea. Prior research on a tongue-stabilizing device, which physically holds the tongue in a forward position during sleep, found that it reduced the severity of apnea events roughly by half.10PubMed Central. Control of Tongue Position in Patients with Obstructive Sleep Apnea: Concept and Protocol for a Randomized Controlled Crossover Trial That is a mechanical intervention rather than a posture-training one, but it illustrates how much tongue position matters for keeping the airway open at night.
Speech and Articulation
Where the tongue rests at baseline also affects how efficiently it moves during speech. Many speech sounds require the tongue to make rapid, precise contact with the palate or the teeth, and a tongue that habitually sits low has to travel further to reach those positions. Mouth breathing compounds the problem because it changes the relationship between the lips, tongue, and teeth. In one study of mouth-breathing patients, over a third had a frontal lisp, and about a fifth had stuttering.11PubMed Central. Mouth Breathing and Speech Disorders: A Multidisciplinary Evaluation Based on The Etiology
Speech-language pathologists who work with articulation disorders routinely assess tongue resting posture as part of their evaluation. A child who cannot produce a clean “s” or “t” sound may be dealing not with a motor-planning problem but with a tongue that simply starts in the wrong place. Correcting the resting posture often improves the speech issue as a byproduct, without the need for intensive articulation drills aimed at individual sounds.
What the Brain Is Doing Behind the Scenes
Tongue posture is not entirely under conscious control, which is part of what makes it tricky to change. The tongue is innervated by the hypoglossal nerve, and its resting position is managed by brainstem circuits that also coordinate breathing and swallowing. Research into the neural control of tongue movement shows that the motor neurons driving the tongue forward are modulated by the same respiratory neurons that control inspiratory drive, but there appears to be some functional separation within the brainstem between respiratory and swallowing circuits.12PubMed. A simple method for evaluation of tongue position In practical terms, this means that breathing pattern and swallowing pattern are both influencing tongue posture at a level below conscious awareness. Changing tongue posture therefore requires more than just deciding to put the tongue somewhere different; it means retraining a semi-automatic neuromuscular habit.
This is also why stress, fatigue, and sleep all affect tongue posture. When you are exhausted, overall muscle tone drops, and the tongue sags. When you are tense, you may clench the jaw and press the tongue into the palate harder than necessary, which is also not ideal. The “correct” posture is gentle contact, not forceful pressing.
Structural Barriers Like Tongue-Tie
Some people physically cannot rest their tongue on the palate because the lingual frenulum, the band of tissue connecting the underside of the tongue to the floor of the mouth, is too short or tight. This is commonly called tongue-tie, or ankyloglossia. A restricted frenulum limits the tongue’s range of motion and forces it into a low resting position regardless of what the person consciously tries to do.
The orthodontic case mentioned earlier involved a patient with both low tongue posture and tongue-tie, and the combination proved difficult to manage. Even after the open bite was corrected with braces, the tongue’s inability to maintain palatal contact contributed to relapse over a decade.5The Korean Journal of Orthodontics. Treatment and retention of relapsed anterior open-bite with low tongue posture and tongue-tie: A 10-year follow-up Releasing a tongue-tie, through a procedure called a frenectomy, is sometimes necessary before tongue posture retraining can succeed. The procedure itself is relatively straightforward, but the follow-up exercises to build new movement patterns are the harder part.
Does Orofacial Myofunctional Therapy Actually Work?
Orofacial myofunctional therapy, often abbreviated OMT, is the main clinical approach to retraining tongue posture. It involves a structured set of exercises targeting tongue strength, lip seal, nasal breathing, and correct swallowing patterns. Therapists typically work with patients over several months, assigning daily exercises that gradually build new muscle memory.
The results in individual studies look promising. In children with sleep-disordered breathing, myofunctional therapy reduced mouth breathing from about 83% to roughly 17%, restored normal tongue resting position in a significant proportion of children, and increased tongue strength and endurance.13PubMed. Can myofunctional therapy increase tongue tone and reduce symptoms in children with sleep-disordered breathing? The nasal ventilation study described earlier also showed meaningful improvements in both tongue posture and airway function after therapy.9PubMed Central. Low Tongue Posture Improvement Effect of Orofacial Myofunctional Therapy Comprehensive Study of Nasal Ventilation Condition Using Computational Fluid Dynamics and Dental Arch Morphology
The broader evidence base, however, is thin. A scoping review that screened over 11,000 records and ultimately included 58 studies found that although 86% of primary studies reported positive outcomes, only about one in five was a randomized controlled trial. Most lacked proper blinding and allocation concealment. Of the comparisons the reviewers judged to be methodologically plausible, none was deemed to have confirmed OMT’s effectiveness to a high level of confidence.14PubMed Central. Effectiveness of orofacial myofunctional therapy in improving orofacial function and oral habits: a scoping review That does not mean the therapy does not work. It means the field has not yet produced the rigorous, well-controlled trials needed to say so definitively. Given the difficulty of blinding someone to whether they are doing tongue exercises, designing high-quality trials in this area is genuinely hard.
For now, OMT is widely used in clinical practice, often alongside orthodontic treatment, and most practitioners consider it a low-risk intervention with plausible benefits. If you are considering it, the quality of the therapist matters at least as much as the protocol. Look for someone credentialed through a recognized orofacial myology organization, and be wary of anyone promising dramatic skeletal changes in adults from exercises alone.
The Evolutionary Angle
The modern epidemic of crooked teeth, narrow jaws, and crowded dental arches is relatively new in human history. Pre-agricultural skulls typically show wide, well-developed jaws with enough room for all 32 teeth, including wisdom teeth. Something changed, and while softer diets and less chewing are the usual suspects, researchers studying the “jaw epidemic” argue that resting oral posture deserves more attention than it has historically received.1BioScience. The Jaw Epidemic: Recognition, Origins, Cures, and Prevention
The reasoning is that chewing forces are intermittent. You chew for maybe an hour a day, total. But the tongue rests against the palate for the remaining 23 hours. The steady, gentle force of a tongue in the right position may matter more for jaw development than the periodic heavy forces of chewing. A mouse study testing the effects of diet texture on mandible shape found that mice raised on soft diets developed shorter mandibles with less developed bone and wider jaw angles. Diet texture accounted for roughly a third of the total variation in jaw shape.15The FASEB Journal. A Mouse Model Suggests How an Industrialized Diet Alters Jaw Form While that study focused on chewing rather than tongue posture, it demonstrates that the mechanical environment of the mouth shapes bone, and it is easy to see how both reduced chewing and altered tongue posture contribute.
The implication is that proper tongue posture is not a modern wellness trend grafted onto anatomy. It is the ancestral default that modern lifestyles, soft diets, pacifier use, and increased rates of allergic congestion leading to mouth breathing, have disrupted.
“Mewing” and What Social Media Gets Right and Wrong
If you have encountered tongue posture online, it was probably through “mewing,” named after British orthodontist John Mew and popularized by his son Mike Mew. The basic instruction is to press the tongue flat against the palate, seal the lips, and keep the teeth together. Proponents claim this can widen the jaw, improve cheekbone definition, and reshape the face without surgery.
Some of the underlying principles are grounded in real orthodontic science. The idea that tongue posture influences jaw development is supported by clinical observation and some research, as described above. A commentary in the Journal of Oral and Maxillofacial Surgery acknowledged that Mew’s theory generates plausible conclusions about how orofacial musculature guides skeletal growth, but warned that the public needs to be made aware it is not based on sound scientific evidence that would make it a viable alternative to orthognathic surgery.16PubMed Central. Tongue Retraining Appliance: Clear Tongue Crib and Clear Tongue Cage Appliance
The core issue is age. In children and adolescents whose bones are still growing, persistent tongue posture changes plausibly influence skeletal development. In adults whose midface sutures have fused, the bones are far less responsive to light forces. An adult who starts mewing might see minor changes in muscle tone and jaw definition over months, mostly from training the masseter and tongue muscles, but the dramatic skeletal reshaping shown in before-and-after photos online is almost certainly a combination of lighting, angle, normal maturation, and wishful thinking. Anyone considering jaw surgery for a genuine skeletal discrepancy should not delay treatment in favor of tongue exercises.
Posture Below the Jaw
Tongue position does not exist in isolation from the rest of the body. The tongue attaches to the hyoid bone, a small horseshoe-shaped bone that floats in the neck and serves as an anchor point for muscles connecting the jaw, skull, and cervical spine. When tongue posture or jaw position changes, the hyoid shifts, and the head and neck muscles adjust in response. Research on patients whose jaw relationships changed over time found that pronounced changes in mandibular position were associated with adaptive postural changes in the cervical spine and craniocervical angle.17PubMed. Changes in jaw relations, hyoid position, and head posture in complete denture wearers
This helps explain why some people with chronic forward head posture, where the head juts out ahead of the shoulders, find that their tongue naturally sits low and their mouth hangs open. The forward head position stretches the muscles that would otherwise help hold the tongue against the palate and keep the mouth closed. Physical therapists who work with head and neck posture sometimes address tongue posture as part of treatment, and vice versa. It is a reminder that the body’s systems do not respect the boundaries between specialties: the orthodontist, the speech therapist, the sleep physician, and the physical therapist may all be looking at different facets of the same underlying problem.
Practical Self-Check and What to Watch For
If you are curious about your own tongue posture, a simple self-check works. Close your mouth, relax your face, and notice where your tongue sits without deliberately moving it. If the broad surface of the tongue is resting against the roof of the mouth and the tip is behind the upper front teeth, you are in a good resting position. If the tongue is sitting at the bottom of the mouth, or if you find your lips naturally parting at rest, you may have a low tongue posture pattern.
Signs that low tongue posture may be causing problems include:
- Chronic mouth breathing: breathing through the mouth at rest or during sleep, especially if you wake with a dry mouth.
- Dental crowding or open bite: teeth that do not meet properly in front, or a narrowing upper arch.
- Speech difficulties: a lisp or difficulty producing certain sounds clearly.
- Snoring or sleep apnea symptoms: daytime sleepiness, witnessed pauses in breathing at night.
- Jaw pain or tension: TMJ discomfort that does not resolve with standard treatments.
None of these alone proves a tongue posture issue, but if several overlap, it is worth raising the topic with a dentist, orthodontist, or orofacial myofunctional therapist. For children in particular, early identification of a low tongue posture pattern gives the best window for intervention, because the bones are still growing and most responsive to postural forces. Adults can still benefit from retraining, particularly for breathing, sleep, and speech, but the skeletal effects will be modest at best.