Mouth taping at night involves placing a piece of tape across your lips before you go to bed so that you physically can’t breathe through your mouth while you sleep (and have to nose-breathe). Though there haven’t been many studies on the practice itself, the benefits of breathing through the nose while sleeping are plentiful, which is leading some physicians to recommend mouth taping at night, with a few precautionary measures.

Breathing (and smelling, which we do through breathing) is primary function of the nose, whereas the mouth exists for speaking and eating, in addition to its capacity for breathing. Breathing is also optimized through the nose, whereas mouth-breathing is not. “Mouth breathing bypasses the functions of the nose, which include filtering the air we breathe for particles [like allergens and pollution], humidification, and bringing the temperature of the air to body temperature before it enters the lungs,” says Raj TerKonda, MD, FACS, otolaryngologist, facial plastic surgeon, and sleep specialist.

“Mouth breathing bypasses the functions of the nose, which include warming, humidifying, and filtering the air we breathe.” —Raj TerKonda, MD, FACS, otolaryngologist

With this warm, moist air from the nose, the throat and lungs can work better than they can with cooler, drier air from the mouth. In fact, research has shown that those who mouth-breathe have lower rates of brain oxygenation—because their lungs can’t absorb the oxygen from the air they’re breathing as effectively—and may even experience less cognitive activity than their nose-breathing counterparts. By contrast, nasal breathing helps “maximize absorption of oxygen from the air you breathe and minimizes irritation in your throat and lungs, all of which can also help improve your sleep quality,” says sleep specialist Angela Holliday-Bell, MD.

For much the same reason (that is, inhaling warmer, moister air), nasal breathing at night can additionally reduce your risk of a dry mouth and sore throat upon waking up. “A drier mouth from mouth breathing can also lower the pH in the mouth increasing your risk for cavities and tooth decay,” says dentist Matthew Asaro, DDS, who also recommends the alternative of nasal breathing for that reason. Not to mention, the lack of saliva production prompted by mouth breathing can allow for more bacteria buildup in the mouth, leaving you all the more likely to wake up with a bad case of morning breath, too.

Well before that point, the closed-mouth position of nasal breathing may also be uniquely beneficial through its ability to reduce snoring. “During sleep, with nasal breathing, the tongue and soft palate are less likely to fall back and obstruct the airway,” says Dr. TerKonda. As a result, you’re not only less likely to snore, but you could also experience fewer interruptions in your breathing (aka, apneas) during sleep, leading to improved sleep quality and less stress on the body, he adds.

Clearly, nasal breathing is the medically superior choice over mouth breathing at night. And that's not just in light of the ways it can improve your sleep, but also for its upsides to your health overall. But, is forcing yourself to nose-breathe by placing tape on your mouth a wise idea? The answer is a strong, “It depends.”

If you don’t have a sleep disorder and you suspect your mouth breathing at night is just a function of a bad habit, it may be worth giving mouth taping a go. A small 2015 study of open-mouth sleepers with mild obstructive sleep apnea found that “porous oral patches” (aka porous tape over the mouth) lessened the intensity and frequency of snoring and apneas. And ostensibly, these changes came by way of increasing nasal (over mouth) breathing—which, as noted above, comes with its own slew of other health benefits during sleep and beyond.

That said, for some folks who mouth-breathe at night, the behavior is a sign of some obstruction limiting their ability to nose-breathe, says Dr. Holliday-Bell, “like congestion from allergies or an illness, or an airway obstruction from conditions like enlarged tonsils or adenoids—aka lymph tissue in the upper airway—or a deviated septum.”

In all of these scenarios, simply putting a piece of tape over your mouth won’t solve the issue causing you to mouth-breathe at night in the first place; it will just make breathing more difficult. (Just imagine taping your mouth shut when you’re so stuffy that you can’t breathe through your nose.) Instead, you’d need to seek treatment for the nasal obstruction, either through medication or a procedure performed by an ENT surgeon, says Dr. TerKonda.

If you don’t have a sleep condition or any sort of obstruction preventing you from being able to breathe easily through your nose, and you decide to try mouth taping at night with clearance from your doctor, Dr. Holliday-Bell suggests using a piece of porous medical tape oriented vertically across the upper and lower lips. It’s also worth noting that you should only use a small piece—the size of a postage stamp, says Dr. TerKonda—to safely seal the lips (without locking them shut).

Additionally, Dr. Holliday-Bell advises avoiding placing the tape over any hair to minimize irritation with removal. “If you find that you’re having any difficulty breathing or anxiety while wearing the tape, you should also remove the tape immediately and consult with your medical provider,” she says.

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