I've had very strong teeth my whole life. Even landed teeth-first on some stairs when I was little, and bounced off again. Chipped a tooth, but its only barely visible.
Two years ago I got my first cavity, and two years later, I got my first root canal.
Root canal... was seriously uncomfortable. Not painful. Just immensely uncomfortable. All of it, from the usual scraping and poking, to the rubber band they wrap around your tooth, to the rubber tent they strap across your face, to the little metal rods they thrust down into the gaping hole in your tooth... all in all a thoroughly unpleasant experience...