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Pilot RCT finds orofacial myofunctional program improves respiratory measures in adults with malocclusionMouth Breathing Fix Works Without Braces

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Key Takeaway
Consider orofacial myofunctional therapy as a potential adjunct for respiratory symptoms in malocclusion, but evidence is from a very small pilot study.

This pilot randomized clinical trial enrolled 13 adults with dental malocclusion undergoing orthodontic treatment. Participants were assigned to either a 3-month orofacial myofunctional program (n=9) or a control group (n=4), though the specific control intervention was not reported. The primary outcomes focused on respiratory function.

At 3 months, the intervention group showed statistically significant improvements in multiple respiratory measures compared to baseline: respiratory symptoms (p<0.001), MBGR score (p<0.001), respiratory type (p=0.041), respiratory mode (p=0.029), maximum phonation time of /s/ (p=0.002), and nasal peak inspiratory flow (p=0.002). The control group showed worsening in respiratory symptoms (p=0.003) and maximum phonation time (p=0.013). Oral health-related quality of life, measured by OHIP-14, showed no significant changes for either group (p>0.05).

Safety and tolerability data, including adverse events and discontinuations, were not reported. Key limitations include the very small sample size (n=13), pilot study design, unspecified control intervention, and lack of reported effect sizes or absolute numbers for outcomes. The 3-month follow-up is short-term.

For clinical practice, these findings suggest that orofacial myofunctional therapy may offer respiratory benefits for adults with malocclusion, but the evidence remains preliminary. The lack of quality of life improvement and unknown safety profile warrant caution. Larger, more rigorous trials with longer follow-up are needed before considering this as a standard adjunct to orthodontic care.

Imagine waking up with a dry mouth and a constant headache. Now imagine fixing that just by retraining your muscles.

Millions of adults breathe through their mouths because their teeth don't line up right. This is called malocclusion.

But here is the problem. We usually blame the teeth alone. Doctors often say you need braces to fix your breathing.

That takes years and costs a lot of money. Many people just want relief today.

The Surprising Shift

For a long time, we thought only straight teeth could fix breathing issues. We believed the jawbone was the only thing that mattered.

But here is the twist. Your muscles matter just as much.

Think of your mouth like a house with a door and a window. If the door (your mouth) is always open, the window (your nose) gets blocked.

This study shows you can close the door by training the muscles that hold it shut.

Your tongue acts like a traffic cop in your mouth. It tells air where to go.

When your teeth are crooked, the tongue often slips down and opens the mouth. This forces you to breathe through your mouth.

The new therapy teaches the tongue to rest on the roof of the mouth. It is like putting a finger on a switch.

Once the switch is flipped, the nose opens up. Air flows freely again.

Thirteen adults with crooked teeth joined this pilot study. They were split into two groups.

One group did the muscle training exercises. The other group did nothing special.

They tracked their breathing for three months. They also checked how they felt about their oral health.

The group that trained their muscles saw huge improvements. Their breathing got much better.

They breathed through their noses more often. Their ability to hold a breath while saying "s" also improved.

This means their airways opened up wider.

The group that did not train their muscles got worse. Their mouth breathing got stronger over time.

This doesn't mean this treatment is available yet.

It is important to understand the limits of this news.

This is good news for adults who hate wearing braces. You can fix your breathing without moving your teeth.

However, talk to your doctor first. They can tell you if this exercise routine fits your specific case.

Do not try to start this without professional guidance. Your mouth is complex.

This was a small study with only thirteen people. It is a pilot trial.

That means we need to see if this works for thousands of people.

We also did not see changes in how people felt about their oral health. That is a surprise.

More research is coming. Scientists will test this on larger groups of people.

They will also check if the benefits last for years.

Until then, this offers a new hope for those who struggle with mouth breathing.

It proves that muscle training can change how you breathe.

Study Details

Study typeRct
Sample sizen = 9
EvidenceLevel 2
PublishedJan 2026
View Original Abstract ↓
PURPOSE: To verify the effectiveness of an orofacial myofunctional program aimed at treating respiratory function in adults with dental malocclusion. METHODS: Thirteen adults with Class II malocclusion undergoing orthodontic treatment participated in this pilot study, randomly divided into an experimental group (EG; n=9) and a control group (CG; n=4). Protocols for oral health-related quality of life (OHIP-14) and respiratory symptoms were applied. Respiratory function was assessed using the MBGR protocol. Additionally, maximum phonation time (MPT) of /s/, nasal peak inspiratory flow, and nasal airflow analysis using a metallic plate were measured. RESULTS: After the intervention, the EG showed statistically significant improvement in respiratory symptoms (p<0.001), MBGR score (p<0.001), respiratory type (p=0.041), respiratory mode (p=0.029), MPT (p=0.002), and nasal peak inspiratory flow (p=0.002). There were no changes in oral health-related quality of life for either group (p>0.05). Three months later, the EG maintained the results, while the CG showed worsening of respiratory symptoms (p=0.003) and MPT (p=0.013). CONCLUSION: The orofacial myofunctional therapy program improved respiratory parameters in oral-breathing adults with malocclusion, with no impact on oral health-related quality of life.
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