whats the right way to breath? inhale Thur mouth, or inhale Thur nose, exhale Thur mouth, etc?

Question

and what about holding an empty bag over your nose and breathing in and out?
I KNOW this belongs in health category.

Answer 1

you should breath threw your nose, it filters out germs and debris that you would just inhale if you breathed threw your mouth. I dont know about the bag, I know if you are hyperventilating you hold a paper bag over your nose and mouth and breath into it, but other than that breathing with a bag over your nose doesn't sound like a good idea