CNET: Wellness creator @lexfiish has over 4.5 million views on her mouth tape TikTok, which says will help wearers get deeper sleep.

By taping the mouth closed at night with a special, skin-safe tape, mouth-breathers are forced to breathe through their noses. We’re naturally designed to breathe in through our noses, according to medical experts. Nasal breathing produces something called nitric oxide

“Nitric oxide is something that vasodilates your blood vessels. If you dilate your blood vessels, it’s going to help out with things like hypertension, which is a risk factor for stroke and heart disease. And it improves circulation,” says Dr. Rajkumar Dasgupta, a pulmonary and sleep specialist.