I have bone mets, I have not had denosumab (note spelling!) but I have been on bisphosphonates for years, ibandronic acid tablets and other related drugs. With these it is definifely OK to have normal dental fillings including repairs - my fillings have reached the end of their design life, and I do like eating whole nuts lol!
Denosumab is NOT a bisphosphonate, it strengthens bones in a different way.
BCC's own page about denosumab:
Hope this helps.
I think its root canal work which is most concerning...I have had various fillings etc done whilst on zometa/denusomab ( which have not involved the root canal) without difficulty....chat to your dentist!xx