Orofacial myology is the study and treatment of the muscles in the face, mouth, and throat that affect how you swallow, chew, speak, and breathe. An orofacial myofunctional disorder (OMD) happens when these muscles work in an abnormal pattern. Therapy for these disorders uses specific exercises to retrain the muscles into healthier, more efficient habits, which can improve breathing, sleep, and even the alignment of your teeth.
What Are Orofacial Myofunctional Disorders?
Orofacial myofunctional disorders are abnormal movement patterns of the face and mouth. The most common one is a tongue thrust, where the tongue pushes forward against or between the teeth when swallowing. In a normal swallow, the tongue presses up against the roof of the mouth, just behind the front teeth.
These disorders often start in childhood. Habits like thumb sucking, prolonged pacifier use, or mouth breathing can train the facial muscles to work incorrectly. When these habits continue past a certain age, the muscles become used to the wrong pattern, and the disorder can become fixed.
Other common orofacial myofunctional issues include lip incompetence, where the lips do not close fully at rest, and a low resting tongue posture, where the tongue sits at the bottom of the mouth instead of the roof. Each of these patterns can have different effects on the face and mouth.
What Causes Orofacial Myofunctional Disorders?
The causes are usually a mix of habit and anatomy. A restricted frenulum, the small piece of tissue connecting the tongue to the floor of the mouth, can prevent the tongue from reaching the roof of the mouth. This is often called being tongue-tied. When the tongue cannot rest correctly, it finds an abnormal position.
Chronic nasal obstruction is another major cause. When you cannot breathe through your nose due to allergies, enlarged tonsils, or a deviated septum, you switch to mouth breathing. Mouth breathing changes the resting position of the tongue and jaw. The tongue drops to the bottom of the mouth to open the airway, which creates a long-term muscle imbalance.
Sucking habits are a leading cause in children. The American Dental Association states that children should stop thumb and finger sucking by age three. If the habit continues, it can push the front teeth forward and create an open bite, which then reinforces the abnormal tongue position during swallowing.
What Are the Signs and Symptoms?
Signs of an orofacial myofunctional disorder are often visible. A child or adult may have their mouth open at rest, with the tongue visible between the teeth. You might notice difficulty chewing with the lips closed, or food spilling from the mouth while eating.
Speech issues are common. An abnormal tongue position can distort sounds like “s,” “z,” “t,” “d,” “n,” and “l.” This is not a cognitive or hearing problem; it is a muscle coordination issue. The tongue simply cannot reach the precise spots needed to make these sounds clearly.
Other symptoms include drooling past age two, a lisp that persists, and noisy chewing. In adults, symptoms may also include jaw pain, clicking in the jaw joint, headaches, and neck tension. These can occur because the facial muscles are overworked to compensate for the poor positioning.
How Are Orofacial Myofunctional Disorders Diagnosed?
Diagnosis is made through a clinical evaluation, usually by a dentist, speech-language pathologist, or an orofacial myologist. These professionals look at the resting posture of the tongue and lips. They observe how you swallow, checking whether the tongue pushes forward or stays behind the teeth.
The evaluation includes an assessment of the range of motion of the tongue. The therapist will check if you can touch your tongue to the roof of your mouth, move it side to side, and lift it without moving your lower jaw. They will also examine the structure of the palate, the presence of a tongue-tie, and the size of the tonsils.
Diagnosis is not based on a single test. It requires observing multiple functions together, including breathing, chewing, swallowing, and speaking. A comprehensive assessment looks at how all these movements work together as a system.
What Is Orofacial Myology Therapy?
Orofacial myology therapy is a program of specific exercises designed to correct the muscle patterns. It is not a passive treatment. The patient must actively practice exercises daily, often for several months, to retrain the muscles.
The therapy focuses on establishing correct resting posture first. The tongue must learn to sit gently on the roof of the mouth, and the lips must close without strain. Once resting posture is correct, the therapy moves to swallowing patterns. The patient practices the correct swallow sequence, where the tongue lifts and pushes food or saliva backward rather than forward.
Exercises may include tongue lifts, where you press the entire tongue flat against the roof of the mouth and hold it. Other exercises strengthen the lips, such as holding a button between the lips or resisting gentle pressure. These are not passive stretches; they are active muscle training, similar to physical therapy for any other muscle group in the body.
The length of therapy varies. Some people see improvement in a few months, while others need longer. The key factor is consistency. Practicing the exercises correctly and daily is more important than the total duration of the treatment.
Who Can Benefit from This Therapy?
Children with persistent thumb-sucking habits or speech sound errors are common candidates. If a child has an open bite caused by a tongue thrust, correcting the muscle pattern can help the teeth settle into a better position. This can reduce the need for extensive orthodontic work later.
Adults undergoing orthodontic treatment can also benefit. If the tongue continues to push against the teeth, it can cause relapse after braces are removed. Myofunctional therapy helps stabilize the results of orthodontic treatment by correcting the underlying muscle force.
People with sleep-disordered breathing, including mild obstructive sleep apnea, may benefit. A low tongue posture can narrow the airway during sleep. Training the tongue to rest higher may help keep the airway more open. The evidence for this is promising but not definitive for all cases, and it is not a replacement for standard sleep apnea treatments like CPAP.
What Does the Research Say?
Research on orofacial myofunctional therapy is growing but has limits. Strong evidence supports its use for correcting tongue thrust and improving certain speech sound errors. Studies have shown that therapy can change the resting posture of the tongue and improve swallowing patterns.
The evidence for its effect on sleep apnea is more mixed. Some studies show improvement in mild cases, while others show minimal change. It is not a first-line treatment for moderate or severe sleep apnea. It may be a useful add-on to other treatments, but it should not replace medical evaluation and standard care.
Some research suggests that myofunctional therapy can reduce the risk of relapse after orthodontic treatment. The logic is sound: if the tongue still pushes against the teeth, the teeth will move again. However, long-term studies comparing treated and untreated groups are limited, and results vary.
Frequently Asked Questions
Is orofacial myofunctional therapy painful?
No, the exercises should not cause pain. You may feel mild muscle fatigue, similar to exercising any other muscle, but sharp pain is not normal and should be reported to your therapist.
How long does orofacial myofunctional therapy take?
Most therapy programs last between 6 and 12 months, depending on the severity of the disorder and how consistently the patient practices the exercises at home. Daily practice is essential for progress.
Can adults benefit from orofacial myofunctional therapy?
Yes, adults can benefit, though it may take longer than in children because the muscle patterns have been established for many years. Success depends on motivation and consistent practice.
Does myofunctional therapy replace braces or speech therapy?
No, it is often used alongside these treatments. It corrects the muscle function, while braces correct tooth position and speech therapy corrects sound production. They work together as a team.
