Practicing nasal breathing can improve nasal breathing efficiency at rest and potentially increase palate space for the tongue.

“Now, many people won't be able to do that. But fortunately, as I mentioned earlier, if you nasal breathe, that is, you deliberately nasal breathe when at rest for some period of time, you will experience an increased ability to nasal breathe. And you should also experience some addition of space within the palate of your mouth to allow your tongue to sit more completely on the roof of your mouth.”