[DenisM]

Before getting alarmed consider doing the math to assign numerical value to level of danger. Wikipedia article on Sievert has the formulas for it, as well as benchmark values to judge the outcome.

If you don't want to do the math, consider this handy chart: http://xkcd.com/radiation/

[cma]

Why does a kid who hasn't lost his baby-teeth need dental x-rays?

[a8da6b0c91d]

The standard defense of the safety of x-ray machines seems to be that you get more radiation from long haul flights. Well, there's a strong argument that flying isn't safe either. Pilots and stewards apparently have elevated cancer rates.