A few questions:  I wanted to know if it was possible to fix a slight overbite with mewing and also wanted to know if is it also possible to push the  mandible up without getting a bigger jaw?

 I have always had a slight overbite, though dentist have told me that it’s not bad enough to affect me functionally, but it bothers me. I was wondering if mewing could possibly fix this without me having to get braces?   As far as my mandible goes, I don’t think is horribly flat, but it could be improved.  I’ve made a point of not breathing through my mouth ever since I was a kid (my aunt told me it was unhealthy) but I don’t really naturally apply a lot of pressure to the roof of my mouth, my tongue just kind of lightly rest there or does whatever (idk, I just never really thought about my tongue posture before I heard about the concept of mewing). 

Also,  I really don’t want my jaw to get any bigger as I am a female with a naturally bigger jaw due to my bone structure.  Other women have actually teased me about having a big jaw and it is something I am a bit self-conscious about (I’ve even considered consulting a plastic surgeon about having Botox injected into my jaw muscles to make it smaller).