On a daily basis i see a lot of people with very poor forward head posture. But most of them have healthy forward grown faces. Why is that? 

My mallaclusion came mainly from poor posture. I started to keep my mouth open at times but i mostly nasal breathed. But i quickly stopped having my mouth open when i discovered you shouldn't.

I've heard of a lot of people on these sites having mallaclusion not from mouth breathing but just from forward head posture.

The only theory i could see as valid, is that if you develop forward head posture but still nasal breath, you'll grow forward.

But if you devlop forward head posture and develop some on and off mouth opening your mandible will be set back, and then start remodeling downwards because of the forward head posture.

And even lately when i've started mewing i've just had continliously downwards growth. Maybe because i haven't fixed my forward head posture yet, and because i cant get my tounge all the way back.

Pls discuss and share your own experiences.