My two lost molars (one in the left upper jaw and the other in the right lower) has partly to do with the fact that I had a stupid cow as a dentist in the 1980s. She was about to make new fillings, becuase the old ones had broken, and since I (14 at the time) had read about the dangers about mercury, I demanded to have composite fillings. She did a sloppy job. Bitch.
But I was right, as I usually am. Now, almost 25 years later, mercury is about to be banned completely in Europe.