If you use CPAP and notice your cheeks puffing, air leaking out of your mouth, or “pressure building” behind your lips, you are not alone.
This is often caused by mouth leak.
Why it happens
CPAP delivers air under positive pressure through your nose. The airway is not a rigid pipe system, it is soft tissue that moves during sleep. If the lips part even slightly, or if the soft palate and tongue position shift, some of that pressurised air can redistribute into the mouth and escape through the smallest gap.
That is why the issue can feel dramatic even when the mouth only opens a tiny amount.
Is it a sinus problem?
Not always. If you can breathe comfortably through your nose during the day, this is often more about pressure dynamics and lip seal during sleep than “bad sinuses”. If nasal breathing feels restricted, especially at night, that can contribute.
If you want the full explanation (including tongue position mechanics), read the longer post here:
CPAP, Mouth Tape, and “Pressure in the Mouth”: What’s Actually Happening?
Products people use to support nasal breathing
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Mouth tape - supports lip seal at night.
View Betta Sleep Mouth Tape -
Nasal support - can help if nasal airflow feels restricted at night.
View BettaSilk Nasal Strips -
Magnetic nasal support - an option some people use to support airflow.
View Magnetic BreatheBand 15 Day Starter Kit
General education only, not medical advice. If you have diagnosed sleep apnoea or concerns about your CPAP therapy, speak with your doctor or CPAP provider.
