News·Posted on Feb. 17, 2016A New Study Shows Calgary Children's Teeth Got Worse After The City Took Fluoride Out Of Its WaterOur precious bodily fluids!by Ishmael N. DaroBuzzFeed Staff, CanadaLinkFacebookPinterestTwitterMail 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.