Eli5: why are we told to breathe in through your nose and out through your mouth if all the oxygen gets in your blood stream in the lungs either way? Would it not be better to just breathe in and out of your mouth for the most oxygen?

Question

Eli5: why are we told to breathe in through your nose and out through your mouth if all the oxygen gets in your blood stream in the lungs either way? Would it not be better to just breathe in and out of your mouth for the most oxygen?

In: Biology

Answer 1

https://www.consciousbreathing.com/articles/mouth-breathing-negatively-affect-childrens-smile-teeth-face-airways/

In that article it explains how your facial structure changes for the worse if you breathe exclusively through your mouth because your tongue posture is bad and doesnt press on the roof of your mouth and help shape your facial structure.