BreatheWorks

What Is Mouth Breathing? How It Starts, and Why It Sticks

Reviewed by Corinne Jarvis
Written by Corinne Jarvis Published 11/16/2020 Updated 08/12/2023

Introduction: A Common Habit with Uncommon Consequences

We all breathe more than 20,000 times a day—but how we breathe matters just as much as how often. Mouth breathing is a habit that may seem harmless, especially in kids or during sleep, but it can have significant, far-reaching effects on nearly every system in the body.

At BreatheWorks, we view mouth breathing as more than just a symptom—it’s often a sign of underlying structural, behavioral, or airway dysfunction that needs to be corrected for whole-body health.

What Is Mouth Breathing?

Mouth breathing occurs when a person regularly inhales and/or exhales through the mouth instead of the nose, either while awake, asleep, or both. While it can be temporary during illness or exertion, chronic mouth breathing creates long-term dysfunction.

This seemingly minor shift in habit disrupts the core functions of the nasal airway, including:

  • Humidifying and filtering air
  • Regulating nitric oxide for blood flow
  • Supporting diaphragmatic (deep) breathing
  • Directing tongue posture for proper jaw and facial development

Why Mouth Breathing Starts

Mouth breathing usually has a cause—not just a preference. Common root factors include:

  • Nasal obstruction: from allergies, deviated septum, or chronic sinusitis
  • Habit formation: especially in childhood or after illness
  • Enlarged tonsils or adenoids: blocking nasal airflow
  • Tongue-tie (ankyloglossia): restricting tongue posture and nasal breathing
  • High stress or anxiety: leading to shallow, upper-chest mouth breathing
  • Sleep-disordered breathing: including undiagnosed obstructive sleep apnea

Often, these causes go untreated for years—leading to structural compensation, facial changes, and even behavioral shifts.

Real-World Case: An 11-Year-Old with Focus Issues and Poor Sleep

This Patient Came to Breatheworks With:

  • Daytime mouth breathing and noisy nighttime breathing
  • Trouble focusing in school
  • Irritability and frequent daytime fatigue
  • Mild crowding of the upper teeth and narrow palate
  • History of enlarged tonsils and seasonal allergies

Our Evaluation Found:

  • Low tongue posture and oral rest dysfunction
  • Poor nasal breathing capacity
  • Forward head posture and shallow breathing
  • Parental concerns of ADHD symptoms worsening over time

We initiated:

  • Nasal breathing retraining and myofunctional therapy
  • Tongue strengthening and lip seal training
  • Collaboration with ENT and pediatric dentist
  • A home routine with postural support and sleep hygiene

After 8 Weeks:

  • Marked improvement in sleep quality and daytime attention
  • More confident chewing and speaking
  • Nasal breathing normalized and posture improved
  • Reduced parental concerns about behavior and fatigue

Why Mouth Breathing Sticks Around

Mouth Breathing Becomes Self-Reinforcing:

  • It weakens the tongue and lip muscles
  • Narrows the upper jaw and flattens the facial structure
  • Disrupts breathing biomechanics, leading to fatigue and brain fog
  • Makes nasal breathing more difficult over time, not less

Without Intervention, Mouth Breathing Can Contribute To:

  • Shortness of breath, shallow chest breathing
  • TMJ dysfunction, clenching, and jaw pain
  • Poor sleep, anxiety, and speech or swallowing issues
  • Facial elongation, dental misalignment, and chronic inflammation

How BreatheWorks Breaks the Cycle

Myofunctional therapy to restore tongue posture and lip seal
✅ Habit retraining and airway-focused exercises
✅ Structural coordination with ENT, dental, and sleep specialists
✅ Pediatric and adult programs to reverse mouth breathing at any age
Speech therapy near me focused on airway, articulation, and swallowing

Key Takeaways

  • Mouth breathing is a symptom with structural consequences
  • It often begins early and becomes ingrained by habit or necessity
  • Myofunctional therapy treats the root, not just the symptom
  • BreatheWorks provides whole-patient care for lasting change

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