To find out more about this, I reached out to Dr. Kristina Wolf. Dr. Kristina replied, “She’s actually not wrong! There are many benefits to mouth taping. Mouth taping is something I recommend to patients for the reasons she’s stated, [as well as] for a whole slew of other reasons.

“It promotes nasal breathing. The nose is our organ for breathing. To skim the surface, nasal breathing is important as it warms, moisturizes, humidifies, and filters the air we breathe. When we breathe air through the nose, it stimulates the release of nitric oxide from our sinuses that surround the nasal cavity. This creates dilation of the blood vessels, which therefore reduces blood pressure, increases the area for gas exchange, as well as acting as a potent defender against pathogens.”

Source: https://www.buzzfeed.com/kelsiehammond1/i-tried-viral-sleep-routine