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Utilization of professional topical fluoride application by age grouping in Taiwan, 2004–2012 (p-value for trend test, <0.001 (all groups)). 1 yr: 1 ≤ age <2, 2 yr: 2 ≤ age <3, 3 yr: 3 ≤ age <4, 4 yr: 4 ≤ age <5.