Cancer Treatment on Dental Care

Most of the literature that revolves around cancer treatments, including radiation, as it pertains to harming one's teeth, states that this might happen if and when the radiation is around the neck or above...  and, while I believe that the literature is correct in its analysis, I believe that it fails to properly address the long term impact of both chemotherapy and immunotherapy on one's teeth.

I say this because, I am in my 14th year of cancer treatments that includes over 150 infusions (both chemotherapy and immunotherapy, 6 radiation treatments, and about 3 years now taking daily immunotherapy pills.  Here recently, I have had 3 situations where parts of my tooth have chipped off while eating, causing 3 crowns, and 1-2 root canals...  and, I say 1-2 because I have yet to find out the exact status of this 3rd chipped tooth.

Interestingly, all of my life, all of my dentists and there have been several have told me that my teeth are very strong and that I should experience minimal cavities, and minimal problems with my teeth...  and, that I should consider myself fortunate.

SO...  why were all these dentists wrong?  Or, were they wrong?  

Sure, I can accept the fact, that as one ages, one's teeth has to age as well but not after being so solid and strong...  I would think...  therefore, the only other factor, and yes I do take proper care of my teeth, is all of my cancer treatments has had a cumulative  effect on my teeth.