I originally got 4 veneers in 1996. In 2007 one broke so I decided to do them over this time getting 8, I then a few years ago got Tmj and got them all done, but I don’t like color, so I was thinking of doing the front 6 over again, this would be the 4th time on these teeth getting veneers is it too risky and if I end up needing root canals are they risky or a big deal.