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I think the real science here is Orthognathic Surgery [1]. I mean - I'm not an orthodontist or a surgeon, but once growth has stopped in the palate as a teenager or young adult I'd be skeptical of claims around bone growth or sculpting. Do you have any resources? [1] https://en.wikipedia.org/wiki/Orthognathic_surgery
I'm 34 and have personally experienced significant changes in my face thanks to orthotropic pressure / mewing, and have the photos to prove it. In addition, my bite has been stable without a retainer, whereas in the past I've had braces twice. My background is I had an undiagnosed mild tongue tie that I discovered a bit over a year ago. I previously couldn’t press my tongue against the roof of my mouth, which led to…
I can't get the back of my tongue up between my molars if I have my front tongue close to my front teeth. I can like either mew my front tongue or back tongue. Any tips?
Also how long did it take you to successfully be able to unconsciously keep your back tongue up? Right now it's hard for me to do it for 10 seconds bc it's so uncomfortable