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| Methods | Cross‐sectional survey conducted in fluoridated and non‐fluoridated areas in US. | |
| Participants | 1103 6‐12 years old examined and 556 lifetime residents with parental questionnaires were used for analysis. | |
| Interventions | Exposure: age started toothbrushing, age started using fluoride mouthrinse. | |
| Outcomes | TSIF. | |
| Notes | Intra‐examiner reliability (Kappa = 0.85). | |
