Will braces change my jaw and mouth area?

i have a 6mm overjet and i am getting braces on both my upper and lower arches, i have a drawn face and would like a wider jaw or some cheeks... my ortho has told me she will be widening my bottom row of teeth and pushing my top row back, will this make my face look a bit wider and give me a wider smile and better face profile?
Will braces change my jaw and mouth area?
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