We are designed to breathe through our noses. The nose filters, warms and humidifies the air, and nasal breathing keeps the mouth closed and moist. Many people, adults and children alike, breathe through their mouths instead, often without realising it, especially at night.
Mouth breathing is more than a habit. It can affect your teeth, your gums and, in children, how the jaws and face develop.
Signs you may be a mouth breather
- Waking with a dry mouth, sore throat or bad breath
- Snoring
- Chapped or cracked lips
- Waking tired even after a full night’s sleep
- Drooling on the pillow
- Lips that rest apart during the day
- In children: snoring, restless sleep, bedwetting, daytime tiredness or trouble concentrating
Why mouth breathing matters for your teeth and gums
Dry mouth
Saliva is one of your mouth’s natural defences. It washes away food, neutralises acids and helps repair early enamel damage. Breathing through the mouth dries it out, especially overnight.
More cavities
With less saliva, acids and bacteria stay on the teeth longer, which raises the risk of decay.
Gum inflammation
Mouth breathing is often linked with red, swollen gums, particularly around the upper front teeth, which dry out easily.
Bad breath
A dry mouth lets odour-causing bacteria multiply.
Mouth breathing in children
In growing children, how the tongue, lips and jaws rest affects how the face and jaws develop. When the mouth hangs open, the tongue tends to sit low instead of resting against the roof of the mouth. Research has linked long-term mouth breathing in childhood with:
- A narrower upper jaw and high, narrow palate
- Crowded teeth
- Bite problems
- A longer, narrower facial appearance
Common causes in children include enlarged tonsils or adenoids, allergies and a blocked nose. Spotting mouth breathing early gives more options, because the jaws are still growing. See our pediatric dentistry page for how we approach children’s care.
Mouth breathing, snoring and sleep apnea
Mouth breathing and snoring can be signs of sleep-disordered breathing, which ranges from snoring to obstructive sleep apnea, where breathing repeatedly stops and starts during sleep. Sleep apnea is linked with daytime fatigue, high blood pressure and other health problems.
Dentists often notice the first signs, such as worn teeth from night-time grinding, a scalloped tongue, a narrow airway or large tonsils. A dentist can screen for these signs, but sleep apnea is diagnosed by a physician, usually with a sleep study.
What a dentist looks for
An airway-focused dental exam may include:
- Tooth wear from clenching or grinding
- The size and position of the tongue and tonsils
- The shape of the palate and jaws
- Gum inflammation patterns linked with dry mouth
- Your bite and how the jaws meet
- Questions about sleep, snoring and daytime energy
What can help
Treatment depends on the cause, and often involves more than one professional:
- Medical assessment of the nose, allergies, tonsils or adenoids, often through your family doctor or an ear, nose and throat specialist
- A sleep study, if sleep apnea is suspected
- Myofunctional therapy, exercises that retrain the tongue, lips and breathing patterns. Vigée Dental has a myofunctional therapist in our office.
- Orthodontic treatment in children to guide jaw development where appropriate
- Protecting your teeth, with fluoride, good hydration and a night guard if you grind
Airway-aware dentistry at Vigée Dental
We look at teeth as part of the whole person, which includes how you breathe and sleep. Our proactive and whole-body approach considers bite, airway and long-term health, not just the tooth in front of us. Our in-office myofunctional therapist works with patients on tongue posture, lip seal and breathing habits. Read more about proactive dentistry or book an assessment online.
Frequently asked questions
Is mouth breathing bad for your teeth?
It can be. It dries the mouth, which raises the risk of cavities, gum inflammation and bad breath.
How do I know if I breathe through my mouth at night?
Common clues are waking with a dry mouth, snoring, chapped lips or feeling tired after a full night. A partner may also notice it.
Can mouth breathing change a child’s face?
Research has linked long-term mouth breathing in childhood with changes in jaw development and tooth crowding. Early assessment keeps more options open.
Can a dentist diagnose sleep apnea?
A dentist can spot warning signs and refer you, but sleep apnea is diagnosed by a physician, usually with a sleep study.