Japan: 40 Years of Falling Tooth Decay—but No Fluoridation

Jun 1st 2026 9:02am EDT

Japan has maintained a stunning long-term decline in rates of tooth decay—without water fluoridation. A new study in the journal BMC Health looks at Japan as a “natural social experiment” on the effects of limited fluoride exposure in children. Children’s Health Defense reports, “Using decades of national dental survey data, the study found that average […]

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