Chronic is linked to dry lips, dental and facial growth changes, speech issues, restless sleep, and attention or behavior challenges.
Definition
- Nasal breathing cleans, warms, and humidifies air before it reaches the lungs. The paranasal sinuses also produce nitric oxide (NO), which supports antimicrobial defense and oxygen delivery.
- Habitual mouth breathing is associated with narrowing of the jaws, lengthening of the face (sometimes called Long Face Syndrome), crowded teeth, and a cycle where narrow jaws further restrict the airway.
- Common signs include noisy or messy eating; dry, chapped lips; allergic shiners (dark circles under the eyes); gingivitis, cavities, or bad breath; abnormal jaw development; crowded teeth; speech issues or hoarseness; and poor sleep or attention concerns.
- Therapy does not replace medical airway care. Collaboration with an ENT or allergist comes first when tonsils, adenoids, allergies, or a deviated septum block the nose.
When to use this guide
- Use this guide if your child sleeps with an open mouth, snores, or wakes unrested — or if an adult "has always been a mouth breather."
- Use it before assuming braces alone will "fix" facial or dental changes tied to breathing habits.
Failure modes
- Starting posture exercises while the nose is still blocked often leads to frustration and incomplete results.
- Ignoring rest posture after medical airway treatment can leave mouth-breathing habits in place.
- Overclaiming OMT as a standalone treatment for sleep apnea or TMJ disease is not how this practice frames care — posture issues are addressed when they exist.
Proof & sources
- OMT of York Mouth Breathing brochure (© 2019) lists signs, growth effects, and the team-first treatment model.
- Angie's published caution: OSA/TMJD research is promising but early — do not portray OMT as a "treatment" for those conditions absent oral rest posture issues.
- Airway & Sleep Health is a dedicated service line at OMT of York for mouth-to-nasal breathing support.
Breathing habits
There is a right and a wrong way to breathe — humans are designed to be nasal breathers.
Flip between modes to compare what the practice teaches about breathing habits and facial growth. Educational only — not a diagnosis.
Nasal breathing
- Filters, warms, and humidifies air before it reaches the lungs
- Supports nitric oxide (NO) produced in the paranasal sinuses
- Pairs with healthy Oral Rest Posture: lips together, tongue on the palate
- Supports healthier facial growth patterns and dental development
Knowledge check · 1/1
Why do clinicians often collaborate with ENT/allergists first for chronic mouth breathing?
Action
If mouth breathing is part of the picture, we help coordinate the right next step — often medical airway clearance plus myofunctional retraining.
Common questions
What is the key takeaway from "Mouth Breathing: Signs and Effects"? +
Nasal breathing cleans, warms, and humidifies air before it reaches the lungs. The paranasal sinuses also produce nitric oxide (NO), which supports antimicrobial defense and oxygen delivery.
When should someone act on this? +
Use this guide if your child sleeps with an open mouth, snores, or wakes unrested — or if an adult "has always been a mouth breather."
What can go wrong if this is ignored? +
Starting posture exercises while the nose is still blocked often leads to frustration and incomplete results.
Sources
- OMT of York brochure: Mouth Breathing (© 2019)
- RDH Magazine: "Clearing Up the Confusion" — Angie Lehman, RDH, COM