Is tooth extraction the best option to fix my lower protruding lip/get a more defined chin? (Photo)

I have braces and my orthodontist has told me extraction of my second molars (upper and lower) would be my only best option to achieve results close to I want (to allow my lips close properly, reduce gummy smile, and define my chin more). He is very sceptical about jaw/plastic surgery in my case. I am really scared that if I go with the extractions it will make my face look worse. I have to make my decision soon. What should I do and what are the risks of the extractions in my case?

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