I am 61 . I've had Rhumetiod Arthritis for about 7 years. I have been taking prednizone, metheltrexate, percacet 5mg, or morphine sulphate 5 Mg. most of the time, ususally at a much higher dose than now. I do have dry mouth during sleep accasionally. 15 months ago I had my teeth x-rayed. No cavites were appearant. In the last 4 months I have lost 4 teeth and I need crowns on about 14 more. I also have osteoperosis. Can you tell me why so many teeth seemed to have decayed so rapidly at one time? Thank you.