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Figure 1. Annual root caries incidence and 95% confidence interval by study. Australia, Canada, Sweden, USA-FL (Florida), USA-IA (Iowa)-1, and USA-NC (North Carolina) met the validity criteria (Appendix Table 3). USA-NY (New York) and USA-WA (Washington) reported findings for both control and treatment groups in caries-prevention trials, because incidence was not statistically different between groups.

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