The exposure to radiation pivots on several factors including the sensitivity of the tissue, scan duration (exposure time), patient’s size, and the tooth X-ray equipment itself. (There are different dental X-ray machine types). Scan duration varies anywhere from 0.125 seconds to 0.32 seconds or more. This is the time that it takes for the device to create the images. And it translates into a different amount of millisieverts (mSv) that a patent will receive during the screening process.