Can adult to braces rectify a sunken mouth, a narrow mouth and a small smile, without emphasising prominent chin? (Photo)

My lips are plump, esp. when I stick my tongue between my teeth. When I don't do that, my mouth aches&I look like an old person without dentures (chin&nose protrude, mouth flat, lips thin). When I smile, it's even worse; my lips go flat to my teeth. If braces move my teeth/jaws forward, would my chin move forward too? My teeth are also crowding with age. I look a bit like this. Because my chin is prominent I don't look like I have a receding chin, but I think my jawline isn't defined.

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