Do I have to extract teeth to straighten and align my teeth? (photos)

I have been to 3 orthodontists, the 1st said i have to remove my 2remaining wisdom teeth at the top and then have braces in for 3yrs, the 2nd and 3rd gave me a similar assessment and said i have to remove 2 moulers at the top and 2 at the bottom 3rd deals with damon system braces. Problem is i dont want to remove any teeth! Can i avoid removing teeth and use an expander and braces? Will this make my teeth go too forward? My orthodontist appointment is in a week and i am going to get xrays done.

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