How to fix a slanted smile? What procedures would I need? (Photo)

I agree with one of the previous docs who said that it maybe your lip and not your teeth per se. Your left side of the lip maybe hyper mobile. Easiest reversible procedure is to try botoxing the left side and see if that will even out your smile. If not an analysis of your teeth position can determine if braces or gum recontouring in addition to veneers would be a better option for you. Good luck!

its my advice to visit orthodontist. photographic analysis is must in yr case. i feel there is no cant in occlusal plane . yr one side lip muscles are hyper active. muscle exercise will correct this. physiotherapist specialized in facial muscles will guide u. but first step is analysis and visit orthodontist for that. 

Hi:You need gum recounting on the upper left lateral and canine and then shorten the teeth to match the right side.  This may require veneers after the gum has been raised up.Best,Dr. Maddahi