Actually, science never supported fluoridation when it began then, in 1945, and now. Coming on the heels of evidence showing that fluoridation is useless and more harmful to the poor, more researchers report fluoridation's tooth decay reduction still is not scientifically proven.
“Fluoridated water [does] not seem, based on the existing literature, to hold sufficient evidence for the reduction of dental caries,” report Italian researchers in the Journal of Clinical and Experimental Dentistry (December 2016).
Sicca, et al. analyzed thirty systematic reviews on tooth decay prevention, from 2002 – 2015, and report “there is not sufficient evidence to determine whether the use [of] water fluoridation has a significant impact in the reduction of caries.”
Other scientists concur. Swedish researchers, in PLOS one, February 2015, reported a “systematic review concerned the caries-preventive effect of water fluoridation [McDonagh]… was graded as low.”
In July 2012, Cagetti, et al. reported “Studies of the effectiveness of water fluoridation have been based on observational study designs… these studies are regarded as low in quality and the weight of the evidence derived from cross-sectional and observational studies can be questionable”
Fluoridation’s foundation is based on human experimental studies which began in 1945. Errors and omissions in those studies were pointed out, but ignored, as early as 1959 by dental researcher Phillip Sutton and others.
In 2011 the West Virginia University Rural Health Research Center reported "...it was found that fluoridation rates were not significantly related to the measures of either caries or overall condition of the teeth for urban or rural areas."
In 2015, the independent and trusted UK-based Cochrane group of researchers could not find any quality evidence that proves fluoridation changes the “existing differences in tooth decay across socioeconomic groups.” or that fluoridation cessation increases decay rates.
In 2009, attempting to prove that fluorosed teeth are less decayed, Kumar reveals 1986-1987 National Institute of Dental Research (NIDR) data which, upon analysis, shows similar cavity rates in permanent teeth whether the water is fluoridated or not (Table 1). Chart depicts data.
More ineffectiveness evidence here.
A December 2016 Health Affairs article claims fluoridation may save money but it’s based on “an assumption of Community Water Fluoridation Programs effectiveness in reducing caries,” the researchers write. It’s not proof of effectiveness as some have claimed.
A recent review paper suggests the following: "The authors conclude that available evidence suggests that fluoride has a potential to cause major adverse human health problems, while having only a modest dental caries prevention effect." and, " Public health approaches for global dental caries reduction that do not involve systemic ingestion of fluoride are urgently needed."
It seems that fluoridation is associated with decreased tooth decay, but ingestion may not be the best application; tooth surface application has fewer health risks.
An interesting argument I recently heard questioned adding fluoride to the whole water system when only a small fraction of it is consumed, and hence used to combat tooth decay. Most of the fluoride added simply returns to the wastewater treatment plant, and is discharged into receiving waters.
Science informs, but there are always many factors to consider when implementing research findings into application. There's lots to debate because science deals with grey areas and uncertainty and reality.
Calgary has recently removed fluoridation from drinking water, but now there is a correlated increase in tooth decay in the city.
Peckham, Stephen and Niyi Awofeso. 2014. Water Fluoridation: A Critical Review of the Physiological Effects of Ingested Fluoride as a Public Health Intervention. Scientific World Journal 2014:263019. doi: 10.1155/2014/293019
It needs to be stopped, Period. Adding a poison to carefully treated safe drinking water! I'll stop before I get to ranting. Read all you want online at: http://fluoridealert.org/
P.S. I have a well at home and refuse to drink Fluoridated water. I even bring jugs of water to work.