Hi friends
I just revisited the issue of radiation risk on my blog bkoffman.blogspot.com with a focus on the exposures at very low doses.
Bottom line- no amount of radiation is good and all exposure is cumulative, but the risk from most plain films and dental imaging is small.
I have included a chart that scales up from the radiation from a banana to that of Chernobyl.
Stay strong.
We are all in this together.
Brian