A pretty huge ceramic inlay had been inserted into the chewing surface a couple of years ago and much later, the tooth seemed to move slightly out of the jawbone, upwards in this case. There was never any pain worth mentioning, but there was some sort of tiny little wound in the gum next to the tooth which wouldn’t go away. So I mentioned this to my dentist, he said to keep an eye on it and then recently, he checked again and decided to clear out the root canals.What was the "something's not right" for you?
What probably happened is the following: when my old dentist tried to save the tooth with the inlay, she had to drill very deep into the chewing surface and ended up really close to the pulpa. It was overheated and damaged which led to its slow and painless demise. The resulting inflammation needed some space and hence pushed the tooth up. It also created small amounts of gangrenous liquid which eventually drained via a fistula, which explains a) the tiny little wound and b) the lack of pain because the pressure between the jawbone and the tooth was never high enough to cause any.