Possibly, as I know that if you dream about teeth then it could mean you are pregnant, also if you dream about cats. I know that's not really answering the question - sorry!
Well I have been pregnant several times and I have NEVER had sensitive teeth as a symptom (I am assuming this is what you meant?)
I suppose it would depend on the person, however it isn't one of the common symptoms that the majority of women have such as nausea, needing the loo more frequently, going off certain foods etc etc.
being pregnant definitely affects your teeth because of a larger use of calcium in the body or something like that, hence free dental treatment when your pregnant. whether it makes them tender though, i don't know