If scuba diving is on your agenda for your next vacation, then you are probably going to need a visit to Dr. Biderman before you make that trip. Apparently the pressure caused by the water, the further down you go, has an adverse effect on fractured teeth. There are even reports of fillings, and crowns, becoming loose as well.

You can learn more about it here: http://www.livescience.com/57362-scuba-diving-linked-to-toothaches.html