What can and should I do about a black margin developing between my veneer and gum line?
Christopher Baer (Aurora, CO) on Nov 17, 2011
Small can be a very subjective term, and if you are developing a dark line at the margin of a veneer, it could mean there is leakage around the veneer. Leakage could be due to decay underneath, or the cement attachment could be weakening. Or it could just be stain accumulating at the margin. I would get it evaluated.