While you have indeed been exposed to a substantial amount of ionizing radiation, a bitewing radiograph results in only around 0.04 mSv of exposure and a full-mouth series of radiographs results in around 0.15 mSv of exposure. To put this into perspective, an average person is exposed to approximately 3 mSv of natural background ionizing radiation over the course of a year (this does not include medical exposure), so a full-mouth series of x-rays (0.15 mSv) is rather trivial and inconsequential in terms of risk.
Post Edited (Delarge) : 4/10/2012 10:31:59 PM (GMT-6)