Read this great book about breathing: James Nestor, 'Breath, the new science of a lost art'. The book reckons that if we breathe properly we could stop snoring, sleep apnoea, and ease asthma, amongst other things. It also talks about our history and how our face shapes have changed over the last three hundred years due to progress. The changing shapes do not aid breathing! I'm really focused on nose breathing now as was breathing too much through my mouth.
Wishing you all well