Snoring & Mouth Breathing

Most adults who snore have been told there is nothing to do about it short of a machine or surgery. That is not quite true. Snoring is partly a muscle and posture problem — where your tongue sits, whether your lips seal, and whether you breathe through your nose or your mouth — and those things respond to training.

This page covers what nasal breathing actually does for you, what chronic mouth breathing costs, and what the evidence says about fixing it. There is a two-minute screener at the bottom.

What nasal breathing does that mouth breathing doesn't

Your nose is not simply a hole that air passes through. It performs work that the mouth cannot.

Nitric oxide

The nasal cavity produces nitric oxide at roughly 900–1,100 parts per billion, against 4–48 parts per billion in the lungs. That matters because nitric oxide is a vasodilator — it widens blood vessels and improves oxygen uptake — and it has antimicrobial properties, helping neutralize bacteria, fungi and viruses before they reach your lungs.

Breathe through your mouth and you bypass that entirely. One study measuring transcutaneous oxygen found levels roughly 10% higher during nasal breathing than oral breathing in most subjects tested.

Filtering, warming, humidifying

Nasal passages trap particulates, warm incoming air to body temperature, and add moisture. Mouth breathing sends cold, dry, unfiltered air straight down, which over time is a recipe for irritation and inflammation of the airway.

What chronic mouth breathing costs

Your mouth dries out

Saliva is the mouth's defense system — it buffers acid, remineralizes enamel, and clears bacteria. Breathing through an open mouth all night dries it up. The consequence is a measurably higher risk of cavities and periodontal disease, plus the dry mouth, sore throat and morning breath most mouth breathers recognize immediately.

Your sleep gets shallower

Snoring is turbulent airflow through a partly collapsed airway. When the tongue sits low and back rather than up against the palate, and the lips fall open, that airway narrows. The result tends to be lighter, more fragmented sleep — which is why people who snore often wake unrefreshed after a perfectly adequate number of hours.

Facial and dental structure — with an honest caveat

Observational studies comparing mouth breathers with nasal breathers have found meaningful structural differences: backward and downward rotation of the lower jaw, increased overjet, narrowing of the upper and lower arches, and posterior crossbite in 49% of mouth breathers versus 26% of nasal breathers.

Here is the honest part, which you will not find on most pages selling this. These findings are associations from observational research. The reviews themselves state that high-quality clinical trials are lacking, so the direction of cause is not fully settled — mouth breathing may drive the structural changes, the structure may drive the breathing, or both. What is clear is that they travel together, and that the functional patterns can be retrained regardless.

What myofunctional therapy actually does

Myofunctional therapy retrains the muscles of the tongue, lips, cheeks and face — specifically tongue resting posture, lip seal, swallowing pattern, and nasal breathing. No device, no surgery. Exercises, consistently, over a course of therapy.

For snoring, the evidence is genuinely good. A systematic review and meta-analysis of oropharyngeal and tongue exercises found snoring improved by roughly 50% in adults, and the improvement showed up across every measure used — Berlin questionnaires, visual analog scales, and snoring recorded during sleep studies.

That is not a cure-all, and it is not the right answer for everyone. But for an adult whose snoring has a functional component, it is a low-risk intervention with real published support behind it.

Where restricted tongue mobility fits in

Not every snorer has a tethered tongue, but the two overlap more than most people realize. Research from Dr. Soroush Zaghi, MD — Harvard-trained ENT and sleep surgeon, Stanford sleep surgery fellow, and Medical Director of The Breathe Institute in Los Angeles — has focused specifically on how tethered oral tissues affect maxillofacial development, upper airway resistance, and sleep-disordered breathing.

His work makes a point worth repeating: the implications of restricted tongue mobility — mouth breathing, snoring, dental clenching, and myofascial tension — remain underappreciated, in part because the peer-reviewed evidence base is still catching up to what clinicians see.

What his protocol demonstrates is the sequencing that matters. In his published approach, myofunctional therapy is delivered both before and after any surgical release — not instead of it, and never as an afterthought. A release without the muscle retraining leaves the old patterns in place. That is precisely why this practice evaluates function first and refers for release only when therapy alone will not get there.

Kelsey completed her myofunctional therapy training with Dr. Zaghi in California, and the therapy-first sequencing on this site reflects that training directly. If you want the full picture of the tongue-tie side, see our therapy-first tongue tie page.

A word on mouth taping

Mouth taping is everywhere on social media right now as a fix for mouth breathing and snoring. Because people ask about it constantly, here is the straight answer rather than the popular one.

The evidence does not support it, and it carries real risk. A 2025 systematic review published in PLOS One examined ten studies on mouth taping. Only two suggested any benefit, and only for a subset of people with mild obstructive sleep apnea. The rest showed no difference. The authors specifically warned of a serious risk of harm — including asphyxiation — for anyone taping indiscriminately, and especially for anyone with nasal obstruction.

If you are mouth breathing at night, the useful question is why. Nasal obstruction, allergic rhinitis, enlarged tonsils or adenoids, and restricted tongue mobility are all treatable causes, and none of them are addressed by taping over the symptom. Myofunctional therapy retrains the muscles so nasal breathing becomes the default — which is a slower fix, and an actual one.

What therapy looks like

• Evaluation first — assessment of tongue posture, lip seal, swallow pattern, and nasal airway function, so we know whether this is even your problem.
• A short daily exercise program — minutes, not hours, done at home.
• Regular sessions to progress the program and correct technique, online or in person.
• Coordination where it's needed — with your dentist, ENT, or physician if the airway picture calls for it.

Sources

• Camacho M, et al. Oropharyngeal and tongue exercises (myofunctional therapy) for snoring: a systematic review and meta-analysis. European Archives of Oto-Rhino-Laryngology. PubMed
• The impact of mouth breathing on dentofacial development: a concise review. Frontiers in Public Health. Full text
• Inhalation of nasally derived nitric oxide modulates pulmonary function in humans. PubMed
• Breaking social media fads: safety and efficacy of mouth taping in patients with mouth breathing, sleep disordered breathing, or obstructive sleep apnea — a systematic review. PLOS One, 2025. Full text
• Zaghi S, et al. Research on tethered oral tissues, upper airway resistance, and sleep-disordered breathing. The Breathe Institute publications