Several months ago, I went to a new dentist.  He examined me and said I had
a cavity, which I suspected since the lower right side of my mouth was a
little sensitive when I ate.  So, he scheduled an appointement for the
following week and had another dentist who I never saw before drill the
tooth.  They had just converted over to this new computer system and all my
x-rays were recorded and given numbers.  The tooth they drilled was in the
right area but farther to the front of my mouth than I thought it should be.
They were also supposed to drill with something other than the traditional
mercury amalgam, and the filling does look lighter but I've never had the
non-mercury amalgam before and this still looks silverish.  Now, my mouth is
bothering me again, a bit more intensely than before, in the same area.  I
strongly suspect they drilled the wrong tooth.

My question is: Should I go back to the same dentist and have him look at
it?  If they did mess up, wouldn't they try to cover it up and would I have
a case to sue them?  I'm inclined to see a different dentist.  Would that be
a better course of action?  I'm open to suggestions.