Mouth breathing in children: more than a habit
3 September 2026 · 4 min read
Chronic mouth breathing changes facial growth, sleep quality and dental health.
Why the nose matters
The nose filters, warms and humidifies air and produces nitric oxide, which improves oxygen uptake. Bypassing it means drier airways, more mouth acidity and a higher risk of cavities and gum inflammation.
Effects on growth
To breathe through the mouth, a child drops the jaw and tongue and tilts the head forward. Held for years, this posture is associated with a longer face, a narrow upper jaw, gummy smiles and crowded teeth.
Finding the cause
Mouth breathing is a symptom, not a diagnosis. Allergies, enlarged adenoids or tonsils, a deviated septum or a narrow jaw all need ruling in or out before therapy can retrain nasal breathing successfully.
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