Posted by: @lo12288

Just that

no, it won't.

@sergio-oms thank, also, do you think that an arched palate will prevent me from mewing properly?

@sergio-oms thank, also, again, if mewing alone can not solve it, can at least improve it to some degree, even if it takes years?

Posted by: @lo12288

@sergio-oms thank, also, again, if mewing alone can not solve it, can at least improve it to some degree, even if it takes years?

Proper oral posture (please stop calling it "mewing") works in little children to help develop the jaws. In adult it is important for several reasons (breathing, getting stable results...). But you should fix the structures (palate, dental archs, short mandible if you have one, with orthodontics and surgery) and then reeducate and strengthen your tongue to achieve a correct oral posture.