Many of them are using outmoded X-ray film that takes a lot more radiation to make an exposure, or they are using 3-D machines that use a lot more radiation.
Of course, this is an area where the state governments are letting the "free market" between the dentists and the X-ray machine makers determine things. That means what matters is how many machines the makers can sell and how many patients the dentists can con into having X-rays.
Nobody seems to care whether or not being subjected to more and more X-rays into your mouth is good for you.
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The yabut.. many dentists have switched to electronic film that doesn't require processing and is faster while requiring less Xray energy. Seems despite the high cost of the electronics the operating cost is lower and the time handling of the films plus electronic archival are pluses enough to switch.
Between insurance companies not paying what they deem excessive numbers of xrays and the Dentists wanting better images faster with less need for room, equipment and stocks of film, developer and the processing machines. The old film Xray was destined to die.
FYI: the old film Xray was Kodaks space and they were always pushing faster lower energy need films.
Now we have enough Computer power and small advanced sensors needed to do 3D imaging. So the nest generation of imaging gear arrives until we move to something else.
Eck!
Not enough of them are making the switch to digital X-rays, though.
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