Mouthbreathing, tongue function / Face development

[Gadwins]

So there is a lot of theory about mouthbreathing and getting FROM THAT a narrow face. But are there enough reliable studies out there with some real measurment and not some unreliable before/after pictures or some unrealiable personal experience? Are there any animal testing?

I found once a study with monkeys, but it was just one study and can't remember where I did find it. I would be interested if somebody has here some real knowledge about this topic.

[kavan]

Lot's of information/papers on that topic including some written way before the advent of the internet. All you have to do is research 'adenoid facies'.

[Gadwins]

So I found much more studies when I searched up for "adenoid faces". If I am not mistaken, there is not really a clear correlation between facial shape and habit how you breath. So the genes still decide how you will look like.