Do I have a weak chin? (photos)

I have an overbite+protrusion and my lower jaw is underdeveloped and is a bit back, my ortho suggested surgery to widen my jaw and move it in correct position. She told me that even with surgery i still need extractions on both of my jaws. My chin is weak and i was wondering if braces alone could fix my profile or how much it will improve? About surgery: Will the bones heal completely and be as though as now? Having titanium screws and plates affects me somehow,i will be able to get MRI scans?

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