I had a dental x-ray two years after being diagnosed. All looked good. I did not want additional radiation after having a maximum dose. Since my teeth looked good at my regular 6 month appt, and I had no complaints or symptoms, I did not have another xray until four years later when I had a slight ache. BIG MISTAKE!
I have endured so much discomfort because I did not know that a problem was brewing. I ended up needing a root canal, an extraction, a new bridge....and it all may have been avoided if we knew a cavity had started.
The benefits of a dental xray every other year outweigh the minute bit of additional radiaiton.

Eva