Why Nasal Breathing Matters for Kids

Nasal breathing means your child breathes in and out through the nose, with the mouth closed and the tongue resting up on the palate. In my office, I look at how a child breathes at every single exam, because the way a child breathes shapes the way their face and jaws grow. When the tongue sits on the roof of the mouth, it acts like a natural brace that guides the upper jaw to grow wide and forward the way it should.

When a child breathes through the mouth instead, the tongue drops down and the lips stay apart. Over time, that pattern can change the shape of the dental arches, crowd the teeth, and keep the upper jaw narrow. The nose also filters, warms, and moistens the air before it reaches the lungs — the mouth does none of that. Kids who breathe through their mouths often wake with a dry mouth, and I watch that closely because drier teeth at night carry more cavity risk.

The red flags I watch for

At every checkup, I look for the small signs: lips that rest apart, snoring, a low tongue position, dark circles under the eyes, restless sleep, or a narrow upper jaw. Snoring in children is often a sign of a restricted airway, so I never brush it off as just how they sleep. If I see several of these signs together, I talk with you about what might be behind them and what the next steps could be.

What we can do about it

Not every mouth breather needs treatment — sometimes it is allergies or a cold, and that belongs with your pediatrician. But when the pattern is habitual, we have gentle tools. One of them is Myobrace, a removable trainer worn 1–2 hours a day plus overnight, which retrains the tongue to rest on the palate and helps correct mouth breathing, low tongue posture, and tongue-thrust swallowing. Because our pediatric dentists and orthodontists work under one roof, we can plan jaw growth and breathing together instead of sending you across town.

At home, watch how your child sleeps and whether their mouth hangs open during the day. Saline spray can help a stuffy nose, and allergies are worth a pediatrician visit. Bring it up at your next appointment — we are at 54 Warren Street, open Monday through Friday 8am–7pm and weekends 9am–4pm, and you can reach us at 212-561-5303.

Frequently Asked Questions

Is mouth breathing in kids always a problem?

Not always. A cold or allergies can cause temporary mouth breathing. It becomes a concern when it is the usual pattern — lips apart at rest, snoring, dry mouth in the morning. That is what I look for at exams.

Can my child just learn to breathe through their nose?

Sometimes, once the cause is addressed. If the pattern is a habit, retraining tools like Myobrace and tongue exercises can help. We decide together after an exam.

Does mouth breathing really change how teeth grow?

Over time, yes. When the tongue drops from the palate, the upper jaw can grow narrower and teeth can crowd. That is why breathing is part of every orthodontic evaluation we do.

Should I see a doctor or a dentist first?

Start with whoever you see soonest. Your pediatrician checks for allergies and enlarged tonsils; I check the bite, jaw growth, and tongue posture. We work from both sides.