Once got a tooth knocked back. . .not out, back. Think of a single brick in a wall being pushed further into the wall about half way but not completely through Anyway it was one of the most painful things I went through. The Novocaine was directly injected to a bundle of nerves and barely worked. When the dentist was realigning the tooth, I had to push him away because I was about to punch him. Yeah, the pain was that much that I almost decked the dentist.