My local NHS dentist told me four of my bottom front row teeth were "dead" and needed lots of treatment involving needles and drills and such, otherwise they'd

My local NHS dentist told me four of my bottom front row teeth were "dead" and needed lots of treatment involving needles and drills and such, otherwise they'd start rotting away and get painful and so on... Oh and that I need a root canal in one molar... Which I thought was strange at the time because I could still feel sensation in them, feel blood supply pumping into them, felt no pain. At the time though I had great trust in dentists so I agreed to the treatment, and an appointment was set for the procedure. On the day I was sat in the dentist chair and whilst they were setting up, I had this instinctual feeling that this whole thing was "wrong!" and before they could even administer the first numbing jab I called the whole thing off. A few years later and I've had no problems with those teeth, or any others for that matter.