I have pain and sensitivity on a tooth with veneer, was it shaved down too low?

I did veneers on 6 of my lower teeth & after 2 weeks, i was in so much pain, the Dr had to do a root canal on 2 of the teeth, now a month later, i'm feeling the same pain & sensitivity on another tooth, could this be the same problem? could it be the reason i'm having this problem is because he shaved it down too much, i just need whiter teeth to match the top, i did veneers on the top 10 yrs ago with no problems.