Is it common or recommended to reshape or reduce existing porcelain veneers?

I've had veneers on my top six teeth for almost 10 years and they are in great shape however I was never 100% happy with the result, they are too round, thick and long. I got them to fix some discoloration due to a calcified tooth and a root canal. Wondering if I should attempt getting them re-done or if its possible to do any reshaping to reduce the roundness and thickness, especially the canine teeth, which look too large. I also would like more variation in the length.