@garritfra An interesting post, and mouth breathing is far more destructive than we realise.

A couple of books that I read a few years ago may interest you. They completely changed the way I approach breathing.

First, Breath, by James Nestor: https://uk.bookshop.org/p/books/breath-the-new-science-of-a-lost-art-james-nestor/3456154?ean=9780241289129

Second, The Oxygen Advantage by Patrick McKeown: https://uk.bookshop.org/p/books/the-oxygen-advantage-the-simple-scientifically-proven-breathing-technique-that-will-revolutionise-your-health-and-fitness-patrick-mckeown/1564261?ean=9780349406695

The second one is a little more athletic performance related, with most basic topics already covered in Breath.

Happy reading :)