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Yet, in the past five years, dozens of Canadian communities have stopped adding fluoride to the municipal water supply, including Calgary, Waterloo, Windsor and Saint John.The federal agency hasn’t updated this number since then, according to spokesperson Sean Upton, but one anti-fluoride group claims that in 2015, only around 30% of Canadians are exposed to fluoridated water.“It benefits everybody who drinks the water, regardless if they have access to dental care or a healthy diet,” explains Musto.Those who oppose the addition of fluoride in water argue that the impact of fluoride on cavities is not as great as it once was.
(Health Canada recommends that fluoride be added to water at a concentration of 0.7 parts per million.) Many reviews have concluded that there is no evidence to show that the recommended levels of fluoride pose any harm.
Elevated rates of a poor health outcome in a community with fluoridated water doesn’t mean that fluoride is the cause, he says.
“Malaria is prevalent in countries where many children don’t wear shoes,” he explains, but that doesn’t mean going bare foot increases one’s risk of malaria.
The only proven undesirable side effect of optimally fluoridated water is dental fluorosis, which poses no health threat, only an aesthetic concern.
(Exposure to fluoride in toothpaste can also cause fluorosis.) According to Health Canada, rates of moderate or severe dental fluorosis are too low to measure in this country.