How to Sleep With Your Mouth Closed: A 3-Step Nighttime Routine

By Dr. Chelsea Pinto, DDS

If you've been waking up with a dry mouth, low energy, or just a sense that your sleep isn't as restorative as it should be, there's a good chance your mouth is falling open at night. The good news? There's a lot you can do to support nasal breathing during sleep - and most of it starts before you even get into bed.

Your 3-step bedtime routine for nasal breathing 

The hour before sleep is one of the most powerful windows for setting your body up to breathe well overnight. Here's the three step routine I recommend:

Step 1 - Saline Rinse: A saline rinse is one of the most effective and underutilized tools for nasal health. It physically flushes out the nasal passages - clearing bacteria, allergens, debris, and buildup that accumulate throughout the day. Think of it as a reset for your airways before bed. Clear passages make nasal breathing significantly easier and more comfortable overnight.

Step 2 - BoomBoom Nasal Stick: After your saline rinse, use a BoomBoom Nasal Stick to support open, comfortable nasal breathing. It's a simple, effective way to keep your airways feeling clear and ready for a full night of nasal breathing.

Step 3 - Mouth Tape: With your nasal passages clear and comfortable, apply a gentle mouth tape over your lips before bed. It gently supports closed-mouth positioning while you sleep - encouraging your body to breathe the way it was designed to, all night long.

Three steps. Five minutes. A completely different night of sleep.

Best sleep position for keeping your mouth closed

How you position yourself during sleep can influence whether your mouth stays closed. Sleeping on your back makes it easier for the jaw to drop open and the mouth to fall apart. Side sleeping, on the other hand, naturally encourages a more neutral jaw position and can make nasal breathing easier to maintain throughout the night.

If you're a back sleeper, it's worth experimenting with side sleeping - even a pillow behind your back to keep you from rolling over can make a difference.

Tongue posture: why it's the missing piece for nasal breathing

Here's something most people have never considered: where your tongue rests matters. The tongue should rest gently on the roof of the mouth - that contact is like an on switch for nasal breathing. When tongue movement is limited - such as with a tongue tie - the tongue can't reach the palate and mouth breathing follows. A narrow, high palate creates a similar challenge: there simply isn't enough space for the tongue to rest properly, and that same narrow structure can also limit space in the nasal passages above, making nasal breathing harder from both directions.

If you suspect tongue posture or movement may be a factor for you, myofunctional therapy - targeted exercises that retrain the tongue and oral muscles - can be genuinely transformative. An airway-focused dentist can help assess whether this is worth exploring.

If you find yourself unable to breathe comfortably through your nose on a regular basis, it's worth consulting an ENT or airway-focused dentist before trying mouth tape. There may be an underlying factor worth exploring - and there's almost always a solution.

How long does it take to train yourself to breathe through your nose?

Like any habit, consistency is key. Most people find that within a week or two of using mouth tape nightly, nasal breathing starts to feel like their natural default - even before the tape goes on. The body adapts quickly when given the right support.

Start with your bedtime routine, be consistent, and give your body the time it needs to settle into its new normal.

Does mouth tape work - and is it safe?

For most people, the answer to both questions is yes, with one condition. Your nasal passages need to be clear and comfortable before you apply mouth tape. If nasal breathing feels difficult or obstructed, that's a sign to address the underlying cause first - an ENT or airway-focused dentist can help. But if your nose is clear and you're ready to commit to the routine, mouth tape is a simple, effective tool. Most people notice a real difference within a few nights, and within one to two weeks, many find nasal breathing has started to feel natural, tape or no tape.

The Bottom Line

Sleeping with your mouth closed naturally isn't about willpower - it's about setting yourself up for success. Plus, mouth breathing at night can contribute to snoring. A saline rinse, a BoomBoom Nasal Stick, and a gentle mouth tape is all it takes to create the conditions your body needs to breathe well overnight.

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.