Mouth Breathing in Children Is Not Normal. Here’s What It’s Doing to Your Child’s Face, Sleep, and Brain.

Watch your child for a moment. Are their lips parted? Are they breathing through their mouth — right now, at rest?

If yes, that's not a minor quirk. Chronic mouth breathing is one of the most consequential things that can happen to a child's developing face, jaw, and brain — and it almost always goes unaddressed.

The Nose Is the Right Tool. The Mouth Is the Emergency Backup.

The nose was designed for breathing. It filters, warms, and humidifies air before it reaches the lungs. It produces nitric oxide, which dilates blood vessels and helps oxygen transfer more efficiently. It drives the proper development of the face and jaw through the pressure of nasal airflow.

The mouth was designed for eating and speaking. When a child breathes through their mouth chronically, they are using the wrong tool — and their body pays the price.

What Mouth Breathing Does to a Developing Face

This is the part most parents — and most doctors — don't know.

The tongue is supposed to rest against the roof of the mouth (the palate). This upward pressure is what drives the palate to expand sideways and the upper jaw to develop its full width. When a child mouth breathes, the tongue drops to the floor of the mouth. That upward pressure disappears. And the palate narrows.

A narrow palate = a narrow upper jaw = crowded teeth above AND less space for the nasal passage above = more nasal congestion = more mouth breathing.

It's a cycle. And it reshapes the face in real time.

Chronic mouth breathers often develop:
- A long, narrow face (sometimes called "adenoid face" or "long face syndrome")
- Recessed chin
- Flat cheekbones
- Dark circles under the eyes
- Crowded, crooked teeth
- Gummy smile (the upper lip can't fully cover the teeth)
- Open bite (front teeth don't touch when the back teeth are together)

These changes happen slowly over years of childhood development. By the time they're visible, significant structural damage has occurred.

The Sleep and Brain Effects

Mouth breathing at night is strongly associated with sleep disordered breathing (SDB). The mouth is a less efficient airway than the nose — more prone to collapse, more prone to vibration (snoring), and more prone to full or partial obstruction.

A child who mouth breathes at night is often:
- Not getting restorative deep sleep
- Waking partially — without knowing it — multiple times per night
- Running a subtle oxygen deficit that affects brain function during the day

The result looks like inattention, hyperactivity, emotional dysregulation, poor memory, and behavioral problems. Often misread as ADHD. Often treated with everything except the actual cause.

What Causes Mouth Breathing?

Chronic mouth breathing usually has one or more of these roots:

1. Nasal obstruction — enlarged adenoids or tonsils, chronic allergies, deviated septum
2. Narrow palate — which itself reduces nasal airway space
3. Tongue tie — a restricted frenum that prevents proper tongue posture
4. Habit — mouth breathing becomes self-perpetuating even after the original cause is addressed

The important thing: identifying the cause determines the treatment. Treating just the habit while ignoring the structural cause won't work long-term.

How Airway Orthodontics Addresses Mouth Breathing

Dr. Yoram Kohanzadeh, Southern California's first certified airway orthodontist, specifically evaluates mouth breathing as part of every airway assessment. His approach:

1. Identify the root cause — is it structural, habitual, or both?
2. Expand the palate and jaws using BioX biological expansion if indicated — creating more space for the nasal airway above and the tongue below
3. Coordinate with ENT and myofunctional therapists when adenoids, tonsils, or tongue ties are part of the picture
4. Retrain nasal breathing habits through the treatment process

Early treatment produces the best results — because the face is still growing and highly responsive. But adults can also benefit significantly.

The Sooner You Act, the Less Damage There Is to Undo

Every year of uncorrected mouth breathing during childhood is another year the face develops in the wrong direction. The good news: the jaw is more malleable than most people believe, and treatment can be remarkably effective when started early.

Take the free airway screening. Know where your child stands.

👉 [Take the Free Airway Screening] — smilebydrk.com/airway-screener

• Northridge — near the 405 & 118
• Newbury Park — Ventura County

📲 Call or text us:
Northridge: (818) 341-5150 | Newbury Park: (805) 498-7785

Dr. Yoram Kohanzadeh | Smile By Dr. K | First Certified Airway Orthodontist in Southern California