The U.S. Preventive Services Task Force recommends that primary care clinicians prescribe oral fluoride supplementation at currently recommended doses to preschool children older than age 6 months whose primary water source is deficient in fluoride.
U.S. Preventive Services Task Force. Dental Caries in Children from Birth Through Age 5 Years: Screening recommendation statement [Internet]. 2014 May [cited 2015 Jun 30]. Available from: http://www.uspreventiveservicestaskforce.org/uspstf/uspsdnch.htm