Probably just fine
We all want the least cumulative x-ray exposure always.
However, the ability to provide an accurate assessment and diagnosis often requires these studies. Because the area of exposure with the dentals is dictant from the rest, there is no need for worry. About them. If your dentist has digital x-rays, the exposure is decreased by 60 - 70 %. You might want to spread out the other 2 if possible.