Water fluoridation
Health and dental organizations worldwide have endorsed its safety and effectiveness. Its use began in 1945, following studies of children in a region where higher levels of fluoride occur naturally in the water. Further research showed that moderate fluoridation prevents tooth decay.
Baixo Guandu
Baixo Guandu was the first Brazilian city to receive water treated with fluoride in 1953 in order to reduce the incidence of caries, especially among children.