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.
Bottled water
Bottled water in New Zealand is regulated by Food Standards Australia New Zealand and must comply with the Food Act 1981. From July 2009 fluoride was allowed to be present in bottled water as an additive or as a natural occurring mineral.