Mouth breathing in children: why it matters for the face and teeth
Do You Know? For patients.
Breathing through the mouth most of the time, often because of large tonsils or adenoids, changes how the tongue, lips and jaw sit at rest.
Why it matters
Tooth position depends largely on the resting pressure of the tongue and lips. When the mouth stays open, that balance changes.
In growing children, persistent mouth breathing has been linked to a narrow upper jaw, crowded teeth and changes in the direction of jaw growth.
When enlarged adenoids or tonsils are removed, studies show improvements in jaw growth and dental arch shape, especially when this happens early. Orthodontic treatment is often still needed.
Signs to watch for in children
Sleeping with the mouth open or snoring
Dark circles and daytime tiredness
Dry, cracked lips
Crowded or crooked teeth appearing early
If you notice these signs, start with your child's doctor or an ENT specialist, and ask about an orthodontic assessment.
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This article is general information and not a substitute for an examination.
References
Singla A, et al. Impact of adenotonsillectomy or adenoidectomy on dentofacial development of children with obstructed sleep disordered breathing: systematic review. Int J Pediatr Otorhinolaryngol. 2026;208:112923. doi:10.1016/j.ijporl.2026.112923
Proffit WR. Equilibrium theory revisited: factors influencing position of the teeth. Angle Orthod. 1978;48(3):175-86.
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