Is My Child a Mouth Breather?
- May 5
- 5 min read
Signs Every Parent Should Know
You notice it at night first.
Your child is asleep, and their mouth is hanging open. Maybe they snore a little — or a lot. Maybe they wake up cranky and tired even after a full night's sleep. Maybe their teacher has mention
ed trouble focusing in class, or the pediatrician keeps noting that their tonsils look large.
You mention it at the next checkup and hear: "Some kids are just like that. They'll grow out of it."
But something feels off. And if you're reading this, you're probably right to keep asking questions.
Chronic mouth breathing in children is not a quirk. It's a pattern — and it has real consequences for sleep, behavior, dental development, and long-term health. The good news is it's also something that can be addressed, especially when caught early.
Here's what to look for.
What Is Mouth Breathing?
Everyone breathes through their mouth sometimes — during exercise, when they have a cold, or when they're crying. That's normal.
Mouth breathing becomes a concern when it's the default. When your child's lips are apart at rest. When they breathe through their mouth during sleep, during quiet activities, during the school day. When nasal breathing feels difficult or simply doesn't happen.
The nose is designed for breathing. It filters, humidifies, and warms the air before it reaches the lungs. It produces nitric oxide, which helps regulate blood pressure and supports immune function. Nasal breathing activates the diaphragm and supports deeper, more restful sleep.
When children bypass all of that and breathe through their mouth instead — night after night, year after year — the effects accumulate.
Signs Your Child May Be a Mouth Breather
Not every mouth breather is obvious. Some children breathe through their mouth only at night. Others do it constantly and no one has connected the dots yet. Here are the signs to watch for:
During sleep:
Mouth open while sleeping
Snoring or noisy breathing
Restless sleep — tossing, turning, frequent repositioning
Waking up tired despite a full night of sleep
Bedwetting beyond the typical age
Night sweats
Waking frequently during the night
During the day:
Lips apart at rest — not just occasionally, but as the default position
Dry or chapped lips
Chronic stuffy nose or congestion that never fully clears
Frequent colds, ear infections, or sore throats
Bad breath despite good oral hygiene
Mouth is dry in the morning
Fatigue, low energy, or difficulty waking up
Behavioral and developmental signs:
Difficulty focusing or sitting still — sometimes misdiagnosed as ADHD
Irritability or moodiness, especially in the morning
Hyperactivity that seems related to poor sleep
Dark circles under the eyes
Slouched posture or forward head position
Dental and facial signs:
Narrow upper jaw or high-arched palate
Crowded or crooked teeth
Open bite — front teeth that don't come together when the mouth is closed
Gummy smile
Long, narrow facial structure developing over time
Enlarged tonsils or adenoids noted at dental or medical visits
If your child snores, you may have been told it's normal — it's not always.
If your child has several of these signs, mouth breathing is worth taking seriously — regardless of what you've been told before.
Why Mouth Breathing Matters More Than Most Parents Are Told
The reason mouth breathing in children often goes unaddressed is that it doesn't look like a medical emergency. It looks like a tired kid, or a picky eater, or a child who just can't sit still.
But the research tells a different story.
Chronic mouth breathing changes the development of the face and jaw. When the tongue isn't resting on the roof of the mouth — which it can't do properly when a child is breathing through their mouth — the palate narrows. The jaw grows differently. Dental crowding follows. And because these changes happen gradually, no single appointment reveals the full picture.
Sleep is disrupted even when it doesn't look like it. Children who mouth breathe during sleep cycle in and out of light sleep more frequently. They don't get the deep, restorative sleep their developing brains and bodies need. The behavioral consequences — inattention, hyperactivity, emotional dysregulation — are real and well-documented. Studies have found significant overlap between the signs of sleep-disordered breathing and the criteria for an ADHD diagnosis in children.
And it compounds. Mouth breathing leads to lower tongue posture, which leads to narrower airways, which makes nasal breathing harder, which makes mouth breathing more entrenched. Without intervention, the pattern doesn't fix itself.
What Causes Mouth Breathing in Children?
Mouth breathing in children usually has one of three root causes — or a combination of them:
Nasal obstruction. Enlarged tonsils or adenoids, chronic allergies, structural issues, or recurrent congestion make nasal breathing physically difficult. The child's body defaults to the mouth because the nose isn't working well enough.
Habit. Sometimes the obstruction clears — the allergies settle down, the adenoids shrink — but the mouth breathing habit remains. The muscles and nervous system have adapted to the pattern, and nasal breathing doesn't return automatically. The adenoids shrink — but the child may still be mouth breathing after tonsil removal
Tongue tie. A restricted frenulum limits how high the tongue can elevate to rest on the palate. Without that proper tongue posture, the mouth tends to fall open and mouth breathing follows. Tongue tie is one of the most commonly missed causes of chronic mouth breathing in children — and in adults.
In most cases, addressing mouth breathing requires identifying which of these factors is present — and addressing all of them, not just one.
What Myofunctional Therapy Does
Myofunctional therapy is an exercise-based program that retrains the muscles of the tongue, lips, and face — helping children establish nasal breathing, correct tongue posture, and develop proper swallowing patterns.
Think of it like physical therapy for the mouth and airway.
At OMT of Oklahoma, we work with children ages 4 and up. When a child comes in for a new patient evaluation, we assess:
Resting tongue posture and elevation range of motion
Lip seal and breathing patterns at rest
Swallowing function and pattern
Frenulum function — visual and functional assessment for tongue and lip tie
Sleep history, dental history, and any symptoms that may be connected
From there, we build a program around your child's specific needs. Sessions happen every other week — in person in Oklahoma City or virtually throughout Oklahoma. Exercises take about five minutes twice a day, and we make them age-appropriate and engaging so kids actually do them.
Most pediatric programs run 12–14 sessions. Many parents notice changes within the first few weeks.
When to Seek an Evaluation
If your child consistently breathes through their mouth — during sleep, at rest, or throughout the day — an evaluation is worth having.
You don't need a referral. You don't need a diagnosis. You just need to show up and let us take a thorough look.
We'll tell you honestly what we see, what we think is driving it, and whether myofunctional therapy is the right next step for your child. If it's not, we'll tell you that too and point you in the right direction.
You've been paying attention. That's already the most important step.
Jennifer DeJonge, RDH, OMT is the founder of OMT of Oklahoma and a registered dental hygienist with over 22 years of clinical experience. She specializes in myofunctional therapy for children and adults in Oklahoma City and virtually throughout Oklahoma.
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