Need help with my submental region and lower jaw

[nicotxne]

19 M, I have damon's braces on rn, and will for the next 8-10 months, but I still want to expand my lower jaw and improve my submental region.
i've been a mouthbreather for about the first 14-16 years of my life, NATURAL SUGGESTIONS ONLY PLEASE!
(or some really safe pharmaceutical)

 

[6foot3User]

you need to hardmax bro if your are 19 there are almost no Natural things to improve