Canada Health Alliance

Is Water Fluoridation Effective?

Fluoride Action Network

According to most major sources, estimates of fluoridation effectiveness amount to at most a reduction of only one-half cavity per child. Low end estimates find no significant reduction at all. Children aged 6-17 average 2.1 cavities in their permanent teeth.

• Cochrane Collaboration2 (2015): 26% (0.5 cavity per child)
• CDC3 (2018): 25% (0.5 cavity per child)
• Iowa Fluoride Study4 (2018): No significant reduction
• World Health Organization data5 (2005): No evidence of fluoridation’s effectiveness

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