7 signs your child is a mouth breather | MYO My Clinic

Mouth breathing is one of those things that can be easy to overlook because it is so common. But common does not mean normal, and the earlier we catch it, the more we can do about it.

Here are seven signs that your child may be breathing through their mouth more than their nose, and what to do if you recognise them.

1. Mouth open at rest

The most visible sign. If your child's lips are consistently apart when they are calm, watching something, or falling asleep, their default breathing route is likely the mouth. Lips should rest gently together.

2. Snoring or noisy breathing during sleep

A child who breathes through their nose sleeps quietly. Snoring, rattling, or consistently audible breathing during sleep is a signal worth paying attention to, especially if it is happening most nights.

3. Dark circles under the eyes

Often called allergic shiners, dark circles in children can be related to sleep quality and nasal congestion, both of which are connected to mouth breathing. If your child sleeps enough hours but still wakes tired and dark under the eyes, their sleep quality may be disrupted.

4. Restless sleep or frequent waking

Children who mouth breathe during sleep often have more fragmented sleep cycles. You might notice they toss and turn, kick off covers, or wake more often than expected for their age.

5. Elongated or narrow lower face

Over time, mouth breathing changes how the face grows. The jaw can become narrower, the lower face longer, and the chin more prominent. These changes happen gradually, which is why early awareness matters.

6. Persistent congestion or always-stuffy nose

This one can feel like a chicken-and-egg situation. Sometimes congestion causes mouth breathing. But chronic mouth breathing can also worsen nasal congestion over time, because the nasal passages are not being used enough to stay clear and functional.

7. Tongue resting forward or low in the mouth

If you ever catch a glimpse of your child's tongue sitting low, pressing against the back of the lower teeth, or resting forward, that is a sign of low tongue posture. It often goes hand in hand with mouth breathing and can affect how the palate develops.

If several of these sound familiar, that is information worth acting on. A myofunctional assessment can give you a clear picture of what is happening and a plan to address it before these patterns become harder to shift.

Book a Guidance Call at myomyclinic.com — a 30-minute paid call ($50 CAD) that gives you real clarity on what your child actually needs

What is Myofunctional Therapy and Does My Child Need It?

If you've stumbled across the term "myofunctional therapy" and found yourself Googling at 11pm, you are not alone. It sounds clinical. Maybe even a little intimidating. But the concept behind it is surprisingly simple, and once you understand it, you may start seeing the signs everywhere.

What actually is myofunctional therapy?

Myofunctional therapy is a guided exercise program for the muscles of the mouth, face, and tongue. Think of it like physiotherapy, but for the oral system.

These muscles control how your child breathes, swallows, chews, and holds their mouth at rest. When they are not functioning the way they are supposed to, it creates a ripple effect through the whole body. Sleep quality drops. Facial development shifts. Teeth crowd. Focus suffers.

Myofunctional therapy uses simple, targeted exercises to retrain these muscles so they work the way they are designed to.

Why does it matter for children specifically?

Children are in a critical window of development. The bones of the face and jaw are soft and responsive, which means the habits and patterns your child develops right now, at 2, at 4, at 7, are actively shaping the structure of their face and airway.

This is both the challenge and the opportunity. The habits that create problems can often be redirected. But the earlier we catch them, the more options we have.

What does a myofunctional therapist actually look at?

During an assessment, a myofunctional therapist evaluates several key areas. Tongue posture at rest — where is the tongue sitting when your child is relaxed? It should be resting on the roof of the mouth with the tip just behind the upper front teeth. Lip seal — are the lips gently closed at rest, or does your child's mouth hang open? Breathing patterns — is your child breathing through their nose or their mouth during sleep, play, and calm moments? Swallowing pattern — a tongue thrust swallow, where the tongue pushes forward with each swallow, can contribute to bite problems over time. Oral habits — pacifier use, thumb sucking, nail biting, cheek chewing. These all tell a story about what the oral muscles are doing.

Signs your child might benefit from an assessment

You do not need a referral or a diagnosis to book a myofunctional assessment. But here are some signs worth paying attention to: mouth open at rest especially during sleep, snoring or restless sleep or dark circles under the eyes, frequent congestion or always seems stuffed up, crowded teeth or an orthodontist has mentioned jaw concerns, tongue tie either treated or untreated, thumb sucking or pacifier use past age 2, difficulty chewing or very selective eating related to texture.

None of these alone is cause for alarm. But several together suggest the oral muscles may not be working as a team, and that is exactly what myofunctional therapy addresses.

Is myofunctional therapy just for kids?

No, adults benefit too. But children are often the most responsive because their systems are still developing. The youngest children we work with at Myo My Clinic are babies as young as 4 months, through our Myo My Mini infant program. Older children, teens, and adults all benefit from therapy as well.

What does a typical program look like?

Every program is different because every child is different. In general, myofunctional therapy involves a comprehensive assessment to understand what is happening, followed by a customized exercise program practiced daily at home, with regular virtual check-ins to progress the exercises and track improvement. Sessions at Myo My Clinic are fully virtual, which means families across Canada can access care without leaving home.

Where do you start?

If any of this resonates, the best first step is a Guidance Call. It is a 30-minute paid call ($50 CAD) where we talk through what you are seeing, answer your questions, and help you figure out whether an assessment makes sense for your family.

Book a Guidance Call at myomyclinic.com