If we're talking dental radiographs on D or E speed film, then no. That equals a few days of background radiation exposure, the kind you get from just walking around outside.
I hope not. Any new patient who sits down to see me can pretty much count on getting 10 on each side. 😛 I'm starting to like FMX films a lot more now that I can delegate them to a hygiene student while I see a second patient.
But drhobie is right. Dental radiography deals with pretty tiny radiation exposures, no more than you'd get from a few days of ordinary environmental exposure. Compare that to a head CT, for example, which gives you nearly a whole year's worth of environmental exposure just for a single study.