The science of fluoride was first established in the 1950s, and it is widely recommended by health authorities worldwide—the World Health Organization, the Centers for Disease Control. It is used, as I said, in half of New Zealand, in Australia, in North America, in the United Kingdom, in Singapore. It has been recommended for a long time by the New Zealand Ministry of Health, and our Prime Minister's Chief Science Adviser, Dame Juliet Gerrard, recently updated the scientific evidence and produced a report showing that fluoride is still overwhelmingly beneficial and safe in terms of preventing dental caries.