Can veneers help fill in dark buccal corridors? (Photo)

I have a smile that appears small to me. I previously had surgery to correct a Class III malocclusion. My upper teeth partly sit inside the lower teeth when I bite down. I think that I would have a nicer smile if my upper teeth were more widely positioned as if I had a wider upper arch. Is it possible to replicate that effect with veneers? I'd rather see white teeth in the corners or my smile where I now see dark space.