I had similar. Did the pre-treatment evaluation, filings, root canal, and an extraction, molars were fine, but six months after radiation, they were infected, and needed extraction, possibly necrotic. Radiation does direct damage to the teeth, loosens them, and causes caries even previously healthy teeth from lack of saliva. Not to mention what damage chemo can do similar. Now I need all my teeth removed, and can't do any HBO yet due to surgery. I don't fault anyone, and know other factors are involved even if proper care was made. Did you husbsnd have dental trays and prescription fluoride?

Good luck with everything.