(WASHINGTON POST) A study published Tuesday in the American Cancer Society journal Cancer reported a link between certain kinds of dental X-rays and the most common brain tumor, one that is almost always benign but can still be debilitating.

The study found at a general level that people with meningioma were more than twice as likely as people without the brain tumor to have had a bitewing X-ray sometime in their life. For a bitewing X-ray, the patient holds the film in place by biting down on a tab.

The exposures to dental X-rays in the study took place in the 1960s, when dental X-rays delivered higher doses of radiation than today’s do. The study compared the self-reported dental X-ray histories of 1,433 adults who had been diagnosed with the tumor with 1,350 who had not.

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