A new study shows that tooth decay among Calgary children has gotten worse since the city took fluoride out of its water supply in 2011.
Fluoride is a naturally occurring element that, in small doses, helps prevent tooth decay.
Health Canada estimated that about 45% of Canadians had fluoridated drinking water in 2010. That number has dropped to "less than 30%" as of 2015, according to the group Canadians Opposed To Fluoridation.
Ishmael Daro is a social news editor for BuzzFeed and is based in Toronto.
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