It's two upper molars. The ones just next to the back teeth.
   Apparently they're the first to go most ppl. My mom was about my
   age, and lost her two bottom molars. For me, they're the TOP
   ones -one cracked off a year ago, the other 6 months ago. It
   doesn't hurt yet. Thankfully, this dentist has a super-duper
   bedside manner. "