How to stop mouth breathing, and why it is worth the trouble

    You catch yourself with your mouth open at the desk. You wake with a dry mouth and a thick head. Your partner says you breathe loudly. Somewhere along the line the nose stopped being the default and nobody mentioned it.

    Do this now

    Clear the nose, then close the mouth

    2 minutes

    1. Breathe out normally through the nose, then pinch it closed and keep your mouth shut.
    2. Nod your head gently up and down while holding, until you feel a moderate need to breathe.
    3. Let go and breathe in through the nose only — small and calm, not a gasp. Keep the mouth shut.
    4. Breathe normally through the nose for thirty seconds, then repeat the hold. Three to five rounds.
    5. The nose usually opens by the third round. Then keep it shut — that is the whole practice.
    Run it with a timer

    What the nose is actually for

    The nose warms, humidifies and filters air, and it adds nitric oxide produced in the sinuses — a vasodilator that improves the match between airflow and blood flow in the lungs. It also imposes roughly twice the resistance of the mouth, which slows breathing and raises carbon-dioxide tolerance. Breathing through the mouth skips all of it.

    Why the habit sticks

    Mouth breathing usually starts with something mechanical — allergy, a cold, enlarged tonsils or adenoids in childhood, a deviated septum — and outlasts the cause. The nose then feels blocked because it is underused, which is self-confirming. Most adults find the nose opens within days of consistent use, which is why the sequence above comes before anything else.

    The night is the harder half

    Daytime is a decision; night-time is not. Nasal breathing during sleep is associated with less snoring and a drier mouth on waking, and small trials of mouth taping report reduced snoring in mild cases. It is also the point at which it stops being a habit question: if the nose cannot pass air lying down, that belongs with a clinician rather than a tape.

    What changes it, over a week

    • All day

      Mouth closed at rest, while walking, and in the gaps between sentences. Notice rather than force.

    • Before each nasal session

      Run the unblocking sequence. Practising nasal breathing through a blocked nose teaches you nothing.

    • On every walk

      Nose only. Slow the pace rather than opening the mouth — the pace is the variable, not the breathing.

    • Each morning

      Note whether your mouth was dry on waking. It is the cheapest measurement of how you slept breathing.

    When this is not a breathing pattern

    See a clinician — promptly, and before assuming any of this applies to you — if any of these describe you:

    • A nose that has never passed air on one side, or an obvious structural blockage — ask about an ENT assessment
    • Loud snoring with witnessed pauses in breathing, or daytime sleepiness — ask about a sleep study before any taping
    • Persistent one-sided blockage, bleeding, or a reduced sense of smell
    • In children: mouth breathing with snoring, restless sleep or poor growth needs a paediatric opinion, not a habit plan
    • Do not tape the mouth at all if you drink alcohol in the evening, feel sick, have untreated sleep apnoea, or cannot breathe freely through the nose while awake

    This page is education, not medical advice, and no part of it is a diagnosis. Full disclaimer.

    Questions people ask

    Is mouth taping safe?
    For a healthy adult who breathes easily through the nose while awake and has been screened for sleep apnoea, small studies suggest it is low risk and may reduce mild snoring. It is not safe with untreated apnoea, nasal obstruction, alcohol in the evening, nausea, or for children.
    How long does it take to switch back?
    Daytime nasal breathing usually feels natural within one to two weeks. Nights lag behind and often follow once the days are established and the nose is reliably clear.
    My nose blocks as soon as I lie down. Why?
    Lying down increases congestion of the nasal lining in almost everyone; in a nose that is rarely used, that tips it over into feeling shut. The unblocking sequence, done in bed, resolves it for most people. If it does not, that is an ENT question.

    What this page is built on

    • — Lundberg, 2008, Nitric Oxide — nasal nitric oxide and its role in the airway
    • — Traditional: Buteyko and later Oxygen Advantage practice, both built on restoring obligate nasal breathing
    • — Huang & Lin, 2015, Journal of Prosthodontic Research — mouth breathing, oral dryness and craniofacial development

    Named by author and year. The DOIs live in the journal.

    Put a number on it

    Most of what is on this page tracks one measurement: the Control Pause. It takes sixty seconds, needs no account, and it is the thing that tells you whether any of this is working.

    Take the free test

    Go deeper

    From the journal

    The breath itself

    Air hunger, sighing, a nose that never clears, a breath that never lands. All topics