I had something similar happen once - This is actually two sort of opposite stories in one:

One reason or another, many summers ago I got a taste for frozen Mars bars. They are lovely an brittle and on a hot summers day (Yes, we even have those in England, occasionaly), but quickly start to melt in your mouth and become chewey.

Anyway, Some friends of mine came over and I had a couple of these in the freezer, and I pulled one out and bit in to it. Well, snapped the end off between my teeth is a better description. Everyone made amazed comments along the lines of "Don't do it! You'll break a tooth!" and I replied "Naaa. I eat these all the time.", which was true.

Halfway through chewing this, I feel a hard lump in the Mars bar, and think "That's odd - bit of peanut or something?". I pull it out and it looks like a chunk of tooth. After failing to figure out how a bit of tooth could get into a Mars bar at the factory, I run my tongue over my teeth and find that half of one of my molars is missing. I felt no pain or discomfort, and 2 weeks later when I got to the dentist, I still didn't feel anything.

A couple of years later, a friend of mine (we'll call him "Henry", and without being cruel he isn't the sharpest knife in the drawer) was eating a Mars bar (normal temperature) and suddenly starts screaming "Arrggh!! My tooth! I've broken my tooth!!" At this stage he didn't know about what happened above and was being entirely genuine. Only it turns out that what he thought was the broken bit of tooth was a peanut.

I think there's a certain symmetry there.

winter"toothless wonder"mute