One in a Million: reports published since last revision in 2012/3 up to and including 2020.
Frazio P and Narvai PC. (2017) Water fluoridation in Brazilian cities at the first decade of the 21st century. Revista de Saude Publica, 51; Epub 15 May 2017.
Centers for Disease Control and Prevention (2020) Community water fluoridation. Fluoridation statistics. Updated 13 January 2020.