How to Stop Mouth Breathing at Night: Causes & Fixes From a Dentist
The way we breathe affects digestion, mood, cognitive function, sleep quality, and long-term health. One of the most common starting points is mouth breathing at night — and once you understand why it's happening, you can do something about it.
Why do people mouth breathe at night?
Mouth breathing at night isn't always a simple habit. Common reasons include:
- Habit — the body can fall into a pattern even when nasal breathing is possible.
- Congestion or allergies — when nasal passages feel blocked, the body defaults to the mouth.
- Narrow palate or airway obstruction — less space for the tongue means the mouth opens.
- Tongue posture and oral muscle tone — the tongue should rest on the roof of the mouth; that contact supports nasal breathing.
What is myofunctional therapy?
Myofunctional therapy uses targeted exercises that retrain the tongue, lips, and facial muscles to support proper posture, nasal breathing, and a natural lip seal. If you suspect muscle tone or tongue posture is a factor, an airway-focused dentist or myofunctional therapist is a great place to start.
Where to start
- Notice patterns: dry mouth, sore throat, fatigue despite a full night of sleep.
- Clear nasal passages before bed with a nasal stick or saline rinse.
- Try mouth tape after rinsing to support closed-mouth positioning.
- Consider myofunctional therapy if tongue posture may be involved.
- Consult an ENT or airway-focused dentist if nasal breathing is regularly difficult.
Your body was designed to breathe through your nose. Start simple, stay consistent, and dig deeper if you need to.
About the Author: Dr. Chelsea Pinto, DDS is a graduate of the Herman Ostrow School of Dentistry at USC with over a decade of expertise in airway-focused dentistry.