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As it stands, undocumented immigrants face financial, legal and linguistic barriers to seeking healthcare, said Dr. Sheiphali Gandhi, a UC San Francisco assistant professor of occupational and environmental medicine.

"We can see a clear link between long-term use -- five years or more -- of these drugs and reduced risk of dementia in older age," says Mozhu Ding, assistant professor at the Institute of Environmental Medicine, Karolinska Institutet, and one of the lead authors of the paper.

"Previous studies have focused on individual drugs and specific patient groups but in this study, we take a broader approach," says Alexandra Wennberg, affiliated researcher at the Institute of Environmental Medicine and the other lead author of the paper.

Dr. Philippe Grandjean, a scientist of environmental medicine at the University of Rhode Island, has also done extensive research into fluoridation but he believes that the NTP report was "unusually modest and fails to recognize the substantial and negative public health impact of fluoride."

“They do not lower the dust level low enough to prevent this severe disease,” said Rosenman, chief of the division of occupational and environmental medicine at Michigan State University.