I had a dentist appt this week (while in 2WW) and while it's not normally the time that we do x-rays (that happens in my July appt), I am having some problems with one molar, so they wanted to do one anyway.
First, it was kinda neat to actually say to someone, "Before we do the x-rays, I have to tell you that there is a chance I could be pregnant." We haven't told anyone that we are TTC, so it was fun to tell someone else.

I told her it was "possible" but not "probable" since there's only a 20% chance each cycle (all else being equal).
Second, the hygenist said that since they use digital x-rays instead of the film-type, there was less radiation. Plus, she said that they completely cover me up with the lead shield drape, so it should be ok.
As I was leaving the dentist's office the hygenist said "Hopefully at your next appointment you'll be pregnant. Good luck!" Excitement came over me at that point -- I hope I am, too!