The difference between a life-long nasal breather and a life-long mouth breather.

The profile of the mouth breather reminds me of this:

Read the book “Breath” by James Nestor. It’s fascinating.

Both of those examples are better looking and in better shape than 80% of this site's posters.

The mouth breathing is the result of a structural issue, in many cases it’s a tongue tie preventing normal skeletal growth, but it could be the result of a broken nose too. Orthodontics and tooth extraction, and that includes wisdom tooth extraction, contribute to the problem. Diet could play a role too.

That graphic looks like a cut and paste from a Third Reich poster

I got very sick after New Years as one does after a holiday season of being in close proximity to a ton of people and I was eating dinner one night and this had never happened ever to me before but my non clogged nostril clogged to match the other one. I had to alternate chewing and mouth breathing and it was hell on earth. So I don’t know how mouth breathers do it tbh

The graphic doesn't even say which one is which and it's bothering me

Yes, facial structure/definition has everything to do with breathing and zero to do with genetics.

I once had surgery to repair a deviated septum...my nose was blocked up with gauze. I went 72 hours without falling asleep because I was unable to fall asleep breathing only through my mouth. I started hallucinating and almost had a heart attack(at ~20 years old). They had to take the splints and gauze out early needless to say.