Is Mewing Hoax?

[Bolsonaro2018]

I've seen thousand theories at internet and maybe it is more one of them. But when it comes to Mewing it has some interesting bases, I really think the tongue position inside our mouth can influence the facial structure.

I've watched some videos, what anthro-users think about it? I would like to read some opinions, thanks

[Joso]

It is probably true but respiration influenciates more, peope with respiration problems less developed faces