How to Stop Mouth Breathing at Night: Causes & Fixes From a Dentist

By Dr. Chelsea Pinto, DDS

If you've noticed more conversation around airway health lately, there's a good reason for it. The way we breathe affects far more than most people realize - our digestion, our mood, our cognitive function, our sleep quality, and our long term health. Airway-focused dentistry has been gaining momentum for years, and as someone who has been working in this space for over a decade, I can tell you: this shift in awareness is long overdue.

One of the most common starting points? Mouth breathing at night. And the good news is, once you understand why it's happening, you can actually do something about it.

Why do people mouth breathe at night?

The first thing I want people to understand is that mouth breathing at night isn't always a choice or a simple habit to break. For many people, there's an underlying reason - and identifying that root cause is the most important step.

Some common reasons people mouth breathe at night include:

• Habit - Over time, the body can fall into a pattern of mouth breathing even when nasal breathing is possible. Retraining is very achievable with the right tools and awareness.

• Congestion or allergies - When the nasal passages feel blocked, the body defaults to the mouth. Addressing congestion before bed can make a significant difference.

• Narrow palate or airway obstruction - Structural factors like a narrow palate can limit the space for the tongue to rest properly against the roof of the mouth. When the tongue drops, the mouth opens and mouth breathing follows. Other airway obstructions can have a similar effect.

• Tongue posture, mobility and oral muscle tone - Most people don't know that the tongue is supposed to rest gently on the roof of the mouth. That contact is like an on switch for nasal breathing. When tongue mobility is limited or oral muscle tone is weak, the tongue can't reach the palate, the mouth falls open, and nasal breathing gets switched off.

What is myofunctional therapy — and can it help? 

This is where myofunctional therapy comes in - and it's one of the most underutilized tools in airway health. Myofunctional therapy involves targeted exercises that retrain the tongue, lips, and facial muscles to support proper posture, nasal breathing, and a natural lip seal. Think of it as physical therapy for your mouth and airway.

For people whose mouth breathing is rooted in muscle tone or tongue posture, myofunctional therapy can be genuinely life changing. It addresses the root cause rather than just the symptom - and the results can ripple outward into better sleep, better digestion, better focus, and more.

If you suspect this might be a factor for you, seeking out an airway-focused dentist or myofunctional therapist is a great place to start.

There's Always a Root Cause

Not every case requires intensive intervention. Sometimes the body simply needs a gentle nudge back to what it was naturally designed to do. During the day, BoomBoom Nasal Sticks are a simple way to support clear, comfortable nasal breathing. At night, a gentle mouth tape applied after a saline rinse can support closed-mouth positioning while you sleep.

How to stop mouth breathing at night: where to start 

If mouth breathing at night feels like your reality, here's how I'd approach it:

• Notice your patterns. Do you wake up with dry mouth? A sore throat? Fatigue despite a full night of sleep? These are all common signs of nighttime mouth breathing.

• Clear your nasal passages before bed. BoomBoom Nasal Sticks or a saline rinse can help support easy breathing through the nose.

• Try mouth tape. After rinsing with saline, apply a gentle mouth tape before bed to keep your lips closed and support nasal breathing overnight.

• Consider myofunctional therapy if you suspect oral muscle tone or tongue posture may be a contributing factor.

• Consult an ENT or airway-focused dentist if you find yourself unable to breathe comfortably through your nose on a regular basis. There may be an underlying factor worth exploring - and there's almost always a solution.

The Bottom Line

Mouth breathing at night is common - but it doesn't have to be your normal. Your body was designed to breathe through your nose, and with the right understanding and tools, supporting that natural function is very achievable. Start simple, stay consistent, and don't hesitate to dig deeper if you need to. The results are worth it.

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. She is passionate about the connection between nasal breathing, oral health, and overall wellness, and dedicates her work to educating patients and practitioners on the power of mindful, holistic care.