Your dentist just told you your teeth are misaligned. Those few years you spent enduring the pain and social awkardness of braces were all for nothing. Not mention the money you’ve spent on orthodontic treatment. Looking for something to blame is understandable, but it’s probably not your retainer or genetics. Often, the real culprit is a silent, repetitive habit you’ve never noticed: tongue thrust.
While it’s associated with children, tongue thrust in adults is a significant orofacial myofunctional disorder that can undermine dental alignment, affect speech clarity, and contribute to breathing problems during sleep. And because it happens without you thinking about it — you swallow roughly 2,000 times a day without thinking about it — most adults don’t find out they have it until a secondary problem brings them in.
Quick Answer: What Is Adult Tongue Thrust?
Tongue thrust in adults is a persistent muscle pattern where the tongue pushes forward or sideways against the teeth during swallowing, speaking, or at rest — rather than lifting to the roof of the mouth. It often traces back to an infant swallowing reflex that was never outgrown, or develops later from allergies, chronic mouth breathing, or prolonged oral habits. Left untreated, it causes open bites, speech lisps, and orthodontic relapse. The primary treatment is orofacial myofunctional therapy: a structured program of neuromuscular exercises that retrain the tongue to rest and function correctly.
What Is Tongue Thrust and Why Does It Go Undiagnosed?
Tongue thrust is a specific pattern within a broader category called orofacial myofunctional disorder (OMD). Instead of the tongue pressing up against your palate when you swallow, it pushes forward against the back of the teeth.
Everyone is born with a natural tongue thrust reflex — also called the extrusion reflex — that prevents choking during nursing. Normally, it disappears when we start eating solid foods, around six months of age. When it doesn’t, or when it re-develops from chronic mouth breathing, allergies, or habits like thumb-sucking, it becomes a structural problem over time.
In adults, it goes undiagnosed for a straightforward reason. The habit is deeply subconscious. You swallow approximately 2,000 times a day. If your tongue is applying even a few pounds of pressure against your teeth with each swallow, that’s enough force to move bone over time. Most adults only discover it when they seek treatment for a secondary issue. That could be jaw pain, a persistent lisp, or the despair-inducing realization that their teeth have shifted back after braces.
How to Tell If You Might Have It
You don’t need a diagnosis to recognize some of the signs. Common indicators in adults include:
- A gap between your upper and lower front teeth even when your jaw is closed (open bite)
- A lisp or difficulty clearly pronouncing “s,” “z,” “sh,” and “j” sounds
- Teeth that have moved or relapsed after orthodontic treatment
- Chronic mouth breathing, even during the day
- Jaw pain, clicking, or frequent headaches without an obvious cause
- A tongue that visibly pushes against or between your teeth when you swallow
None of these by themselves mean you definitely have tongue thrust, but a few of these symptoms together might warrant an evaluation. For a more detailed breakdown, this post on the signs you might have tongue thrust covers the full symptom picture. A dental professional or orofacial myofunctional therapist can assess your swallow pattern and tongue rest posture directly.
The Dental Toll: Open Bites and Orthodontic Relapse
The tongue is one of the strongest muscles in the body relative to its size. When it’s chronically mispositioned, the constant pressure acts like a slow-motion force applied directly to the teeth.
Open bite. The most recognizable dental sign is an anterior open bite. That’s when the upper and lower front teeth don’t meet when the jaw is closed. The tongue, resting between the dental arches, physically prevents the teeth from sitting in their correct vertical position.
Orthodontic relapse. This is what frustrates patients most. If braces correct a misalignment but the underlying tongue behavior is never addressed, the tongue will push the teeth back toward their original position. Your retainer didn’t fail — it’s just a muscle pattern continuing to do what it always did. Addressing the OMD before or alongside orthodontic treatment is what makes the result stick. Research published in the American Journal of Orthodontic and Dental Facial Orthopedics found that orofacial myofunctional therapy combined with orthodontic treatment dramatically reduced open bite relapse compared to orthodontics alone. It’s also worth knowing that some of these bite issues are among the dental issues Invisalign can fix — though the tongue habit needs to be managed alongside any aligner treatment for the result to last.
Speech. The tongue’s position is critical for clear articulation. Adults with tongue thrust frequently struggle with sigmatism — a lisp — particularly on “s,” “z,” “sh,” and “j” sounds. When the tongue sits too far forward, “say” comes out as “thay.” Even years of conventional speech therapy won’t fix this issue if the physical mechanisms aren’t addressed first.
The Systemic Connection: Breathing, Sleep, and TMJ
Tongue thrust in adults by itself is rare. Usually, it’s part of a broader pattern involving how you breathe and how your jaw functions.
Mouth breathing and airway development. Correct oral rest posture involves lips gently sealed, jaw closed, and tongue resting against the roof of the mouth. This naturally promotes nasal breathing. When the tongue sits low — like it does in tongue thrusting — it encourages mouth breathing instead. Chronic mouth breathing is associated with a narrower upper jaw and underdeveloped sinus cavities, particularly when it begins early in life.
Sleep apnea. There’s a meaningful relationship between low tongue posture and airway constriction. When the tongue habitually rests low and forward, it can fall back into the throat during sleep. That can cause obstructive sleep apnea in susceptible adults. Thus, myofunctional therapy is increasingly being incorporated into sleep apnea treatment protocols.
TMJ and jaw pain. The bite imbalances caused by chronic tongue thrust put abnormal stress on the temporomandibular joint. The jaw muscles compensate over time, leading to chronic TMJ pain, clicking, and tension headaches. Stress and anxiety compound the problem — they trigger clenching and grinding. That adds more pressure to a jaw that’s already working harder than it should.
Yes, Adults Can Fix It: Orofacial Myofunctional Therapy
This is the question most adult patients have. The answer isn’t always obvious from older information about tongue thrust: yes, adults can correct it. It takes longer than childhood intervention, and it requires consistency, but the research is clear. It’s certainly doable.
Older approaches tried to solve tongue thrust mechanically. They used appliances called “tongue cribs” or “rakes” that physically blocked the tongue from pressing forward. But the temporary barrier they provided didn’t change the underlying muscle behavior. Thrust would usually come back once the appliances were removed.
The current standard of care is orofacial myofunctional therapy (OMT): a structured program of neuromuscular exercises targeting the tongue, lips, and facial muscles. Therapy is designed to:
- Strengthen the tongue and the muscles around the mouth
- Retrain the tongue to rest against the palate rather than the teeth
- Establish correct swallowing patterns with the lips sealed and tongue moving back, not forward
- Promote consistent nasal breathing
Treatment length varies by case and by how deeply ingrained the habit is. Most adult programs run several months of regular exercises, with measurable milestones along the way. A study found OMT to be 80–90% effective in correcting rest posture and swallowing function with long-term stability.
Successful treatment is usually collaborative — dentists, myofunctional therapists, and sometimes speech-language pathologists working together, especially when orthodontic relapse or significant speech issues are part of the picture. For a full overview of what treatment involves, this guide on understanding and treating tongue thrust covers the process in depth.
The team at The Silverstrom Group in Livingston, NJ takes this integrated approach, addressing tongue thrust alongside any related general or cosmetic dental needs to ensure treatment outcomes hold over the long term.
Key Takeaways
- Tongue thrust in adults is common and usually undiagnosed until a secondary problem appears, like shifting teeth, a lisp, or jaw pain.
- The mechanism is mechanical: 2,000 swallows a day with the tongue pressing against the teeth is enough force to move bone over time.
- Open bites and orthodontic relapse are the most common dental consequences. Braces alone don’t fix the habit that caused the problem.
- Tongue thrust is linked to mouth breathing, obstructive sleep apnea, and TMJ disorders. It’s rarely just a tooth issue.
- Adults can correct tongue thrust through orofacial myofunctional therapy. It requires consistent practice, but outcomes are stable and well-documented.
- Treatment works best as a team effort between dental and myofunctional professionals, particularly when orthodontic work is involved.
What Happens If You Leave It Alone?
Untreated tongue thrust doesn’t stay the same. It compounds. Teeth continue to shift. Open bites widen. The jaw adapts in ways that increase TMJ load. Breathing patterns that were suboptimal become more entrenched. And any cosmetic or restorative dental work done without addressing the underlying muscle pattern is at risk of being undone by the same force that created the problem in the first place.
The good news is that the treatment is non-invasive, evidence-based, and available. If you’ve been noticing signs of tongue thrust or have had repeated orthodontic relapse without a clear explanation, a consultation is the right first step.
Resources
- Cleveland Clinic. Tongue Thrust: Signs, Causes & Treatment.
- Washington SC, Ray J. Orofacial Myofunctional Assessments in Adults with Malocclusion: A Scoping Review. International Journal of Orofacial Myology and Myofunctional Therapy. 2021; 47(1):22-31. https://doi.org/10.52010/ijom.2021.47.1.4
- CDC. About Oral Health.
- Shah SS, Nankar MY, Bendgude VD, Shetty BR. Orofacial Myofunctional Therapy in Tongue Thrust Habit: A Narrative Review. Int J Clin Pediatr Dent. 2021;14(2):298-303. doi:10.5005/jp-journals-10005-1926
