27/08/2026
👄 Why does your dentist ask if your child breathes through their mouth?
It might seem like an unusual question at a dental check-up, but the way your child breathes can tell us more than you might think.
Persistent mouth breathing in children can be a sign that something is making it difficult for them to breathe comfortably through their nose such as enlarged tonsils or adenoids, allergies, or nasal obstruction.
And it’s not just about teeth.
🌙 Sleep & breathing
Mouth breathing can occur alongside snoring and sleep-disordered breathing. Poor-quality, interrupted sleep can affect how children function during the day, including their behaviour, mood, attention & performance at school.
🧠 Behaviour & concentration
A child who isn’t getting good-quality sleep may not always look tired. Some children can instead appear restless, irritable, inattentive or have changes in behaviour. This is one reason questions about sleep, snoring & breathing are important when assessing a child.
🦷 Teeth, jaws & facial development
Chronic mouth breathing has been associated with changes in jaw & facial development & can occur alongside narrow dental arches, crowding & bite problems. At Coast Family Dental, monitoring how your child’s teeth & jaws are developing allows us to identify concerns early &, where appropriate, work alongside other health professionals such as an ENT specialist.
🪥 Could it affect dental health?
There is also evidence suggesting that children who mouth breathe may have a greater risk of plaque accumulation, gingival changes and dental decay. One reason may be that breathing through the mouth reduces moisture in the mouth, affecting the protective role of saliva.
These signs don’t necessarily mean there is a serious problem, but they are worth mentioning at your next appointment.
At Coast Family Dental, we look beyond just checking for cavities. We monitor your child’s teeth, bite, jaw development & oral health as they grow, and when we identify possible airway concerns, we may recommend further assessment with an appropriate health professional.
