From Richard Clopton:

Re: Tumor risk from dental X-rays not eliminated, study finds (April 11): This study's results are subject to recall bias which makes it unreliable. Bite wing x-rays do not expose the brain to scatter radiation on modern machines, and even 40 year ol machines where the x-rays are collimated to reduce exposure. Additionally, the x-ray beam is not pointed at the meninges.

Richard Clopton, DDS