There are so many mixed opinions and levels of knowledge & understanding about ORN. It was my own dentist who told me about it, not anyone at the hospital. To push the blame on you, littlerosie, by saying you don't clean your teeth is appalling - radiotherapy causes this. I have been looking into the issue of consent & informed consent and I believe that hospitals are acting illegally by not informing patients of the risk of ORN. The greater dose of radiotherapy the greater the risk (especially over 40 greys - I have 70 greys).And I've been told that the risk never goes away.
I read that you had hyperbaric oxygen treatment when you had teeth out previously, I know someone who has been having it once a week for about 3 years just to keep it at bay - and his consultant is now a firm believer in oxygen.