Most of us breathe through our mouths without ever noticing. It happens during exercise, while we sleep, even while we're just sitting at a desk. But a growing body of research — popularised by journalist James Nestor in his book Breath — suggests that how we breathe matters just as much as how much we breathe.
Nasal breathing filters, warms, and humidifies the air before it reaches your lungs. It also increases nitric oxide production, which helps widen blood vessels and improve oxygen circulation. Mouth breathing skips all of that.
Over time, habitual mouth breathing has been linked to snoring, poorer sleep quality, and even changes in facial structure in children. Switching back to nasal breathing — even gradually — can support deeper, more restorative sleep.
Building the habit
That's where tools like mouth tape and nasal strips come in. They're not a cure-all, but they're a simple, low-effort way to encourage your body back toward its default: breathing through your nose.
Start gently. If you're new to mouth taping, try a lighter hold before committing to a full seal, and always stop if you experience any discomfort or difficulty breathing.