20 May 2026
Why the Way You Breathe Is Quietly Shaping Your Teeth
“Do you breathe through your mouth at night?” It is not the question most patients expect from their dentist. But for Dr David Cowhig, it is often the most revealing one, particularly when worn front teeth, gum disease, or unexplained decay are sitting in the chair in front of him. In a recent Mouth Health Natters conversation with Alana Inwood, certified Buteyko practitioner and founder of Breathscape, the discussion kept returning to one idea that rarely gets enough attention: the airway is where dental health and whole-body health meet.
The Mouth Was Never Designed for Breathing
When air enters through the mouth rather than the nose, the mouth dries out. Saliva depends on moisture to do its job — maintaining a stable pH and protecting against harmful bacteria. Without it, that balance shifts. As the oral environment becomes more acidic, the bacterial strains associated with gum disease and tooth decay find more favourable conditions to thrive. There is also a structural dimension that is easy to overlook. As Alana Inwood explains, one of the tongue’s jobs is to press up against the palate — and it is that repeated pressure during development that encourages the upper arch to grow broadly. When breathing shifts to the mouth, the tongue drops and sits against the lower teeth instead. The upper arch narrows, the lower jaw adapts to fit, and crowding follows.
What Happens When the Jaw Compensates
The consequences do not stop at the gums. Patients who struggle to breathe through the nose during sleep often present with flattened or chipped front teeth, a forward head tilt, and visible neck and shoulder muscle tension. The body, in its effort to open the airway during sleep, pushes the jaw forward, and the front teeth wear flat and begin to chip. This is also why nasal breathing matters directly to implant patients. Mouth breathing increases the likelihood of nocturnal clenching, which elevates the risk of implant failure. For Dr Cowhig, establishing adequate nasal airflow before any significant dental procedure is not an optional extra — it is part of the foundation. Nasal breathing also produces nitric oxide, a gas that triggers vasodilation (relaxing and widening blood vessels) and supports the body's natural regulation of inflammation. Bypassing the nose means bypassing this mechanism entirely.
Where to Begin — and What to Expect
Alana Inwood uses a baseline assessment called the Control Pause to establish where a patient’s breathing currently sits. The method is straightforward: after a relaxed exhale, the breath is held until the first definite urge to breathe. The result, measured in seconds, offers a useful indicator of carbon dioxide tolerance — a factor that underlies how efficiently oxygen is delivered to tissues. Under 20 seconds suggests meaningful room for improvement; under 10 is not uncommon in people with anxiety, chronic fatigue, or disrupted sleep. For those wanting to begin without clinical supervision, the most practical entry point is simply noticing. Lips sealed during a walk. Nose breathing is maintained during gentle movement. The first few days often feel effortful — slightly restricted, a little uncomfortable. That sensation is normal, and it tends to ease within a week as the body adapts.
Building the Habit
Breathing patterns do not live only in exercise. Alana assesses breathing across the full 24-hour cycle — the commute, desk hours, wind-down, and sleep. A useful anchor is any activity that is already habitual: a lunch break walk, the first few minutes at a desk in the morning. Lips closed, exhalation slightly longer than the inhalation. Done consistently, the pattern begins to feel less like a technique and more like a default. For anxious breathers, Alana Inwood recommends humming as a gentler entry point. The vibration stimulates the vagus nerve, and she notes it increases nasal nitric oxide production by around 70%.
