OK, you brought back a terrible memory so I thought I would throw in my 2 cents worth.

Eating ribs at Harrahs when all of a sudden I became overcome with pain so bad I broke out in a cold sweat. I jumped up and left the restaurant because I needed air. Casino security came running over positive I was having a heart attack (I look like a great I have a lot of potential in that area). I argue with them, they insist I lie down, they keep taking my vitales, I refuse an ambulance. Finally after 20 minutes(?) the pain lets up enough for me to tell where it is coming from (I could not tell to that point)...it is my tooth. Seems I ran a sliver of rib bone through the tooth? No I do not know how.

Go to the dentist the next day. Although I have great teeth and never had a cavity or any other dental problem I paid the price for not listening to my dentists for years. They kept telling me to have my wisdom teeth out. The dentist told me the tooth that broke was rotted inside because the wisdom tooth next to it.
Had all 5 teeth removed at one time and no problems since.

I to find it hard to believe a healthy tooth could be split from chewing on crusty bread, but who knows.