Dental X-rays, especially today’s digital versions, are extremely safe and use very little radiation. As a precaution, dentists use lead aprons to cover reproductive organs so that radiation doesn’t have the chance of affecting the cells inside of them (which would lead to atypical conditions in offspring.) Due to the cumulative effects of radiation, dental staff make a habit of stepping outside of the room when X-rays are taken.
That being said, they’re still quite safe. In fact, a person will get more radiation from spending a day out in the sun on the beach or on an airplane flight across the country than they would a set of full mouth dental X-rays at their dentist’s office.