I am presently using the flouride trays. I've lost 4 teeth (now have implants) and I have so far had 3 teeth crowned and need 4 more. I, too, switch back and forth every 3 months between the dentist and periodontist but the decay came up all of sudden and all at once. Everyone was looking at my bones, then all of a sudden they noticed the decaying. I read Bob Wilson's Adjunctive Therapy but need to find out what PO bid is to try his solution for drymouth.