So much good information in this thread -- thanks @gently and others. @gently, do you have any information on whether Fosamax or Reclast is "safer" -- meaning less likely to cause ONJ??? I haven't been able to find much info, and my doc (a specialist at Cleveland Clinic) is recommending Reclast once I stop Tymlos. According to her, both stay in your bones, so one is not better than the other. I was thinking Fosamax would be better because you could stop taking it if you needed invasive dental work.