Dental X-Rays

Dental X-rays are images of your teeth that your dentist uses to evaluate your oral health. These X-rays are used with low levels of radiation to capture images of the interior of your teeth and gums. This can help your dentist to identify problems, like cavities, tooth decay, and impacted teeth. Dental X-rays may seem complex, but they’re actually very common tools that are just as important as your teeth cleanings. Dental X-rays are typically performed yearly, or more often if your dentist is tracking the progress of a dental problem or treatment.

While dental X-rays do involve radiation, the exposed levels are so low they’re considered safe for children and adults. If your dentist uses digital X-rays instead of developing them on film, your risks from radiation exposure are even lower. Your dentist will also place a lead “bib” over your chest, abdomen, and pelvic region to prevent any unnecessary radiation exposure to your vital organs. A thyroid collar may be used in the case of thyroid conditions. Children and women of childbearing age may also wear them along with the lead bib. Pregnancy is an exception to the rule. Women who are pregnant or believe they may be pregnant should avoid all types of X-rays. Tell your dentist if you believe you are pregnant, because radiation is not considered safe for developing fetuses.

( from http://www.healthline.com/health/dental-x-rays#Overview1 )