I went to the dentist a month or so ago because I was having cold sensitivity in a tooth he had worked on last October. He did x-rays and everything looked fine, but he said, "I can guarantee you will need a root canal." It was the end of the discussion and I am in the market for a new dentist. Yes, my tooth did turn out to be infected but he didn't know that at the time. And I am determined to save my tooth, not kill it.