Paul Connett, Ph.D., a retired chemistry professor, is executive director of the Fluoride Action Network (FAN).
"Connett, for example, has regularly cited a study from China  as finding a doubling of hip fractures when people consume water with 1.5 ppm fluoride and a tripling of fractures when consuming water of greater than 4.3 ppm fluoride. This is cited as evidence of the deleterious effect of water fluoridation on the bones. What Connett does not state is that the doubling of hip fractures at 1.5ppm is not statistically significant and that the authors' find a 'U' shaped relationship between the amount of fluoride in the water and fractures, with optimally fluoridated water actually conferring a protective effect on bone fractures. " 
- Stephen Barrett, "Should You Believe Paul Connett? Part 1. Should Fluoride Be Considered Bad Medical Practice?, Dental Watch, April 10, 2013.
- Debate on fluoridation between Paul Connett and Ken Perrott, from late 2013.