I brush twice a day but rarely floss >_>
My parents refer to my teeth as the 10,000 dollar mouth because I've had dental problems
My front teeth and the ones next to them had second teeth growing behind them that were fused to the ones in front, in order to get braces (which I desperately needed as my teeth looked almost like swung inward saloon doors) they had to file these teeth down (apparently this is pretty rare as my dentist put me in some dental magazine and took like a million pictures of my teeth >_>.) In the process they hit a root which caused an abscess which was one of the most painful things ever to happen to me.
This called for an emergency root canal. Upon opening my mouth up they discovered I suffered from a phenomenon known as "onion roots" (on my front teeth only) meaning each tooth had a series of roots rather than just one. Hoping to save my teeth they removed only one layer of roots (both sides, since afraid of causing another abscess.) I had an adverse reaction to the Novocaine and half my face swelled up.
So five years of braces later (from aged 10 to fifteen) one of my front teeth turns gray. So much for saving the teeth. Now its five root canals later (on each tooth, getting rid of all the roots, although they did it all in two visits) and I have porcelain front teeth (funny story about them, though. The day I got mine another shipment of false teeth was hijacked. That's right, some guy stole hundreds of front teeth.)
Anyway, that's the story. I have had one other root canal as I split a tooth down the middle from chewing on a pen cap.