Where public water supplies are fluoridated further fluoride by mouth is typically not needed. The researchers investigated cities that had both fluoridated and unfluoridated water. The water is clarified and filtered then chlorinated and fluoridated. In areas without fluoridated drinking water, these rinses are recommended for children. Use of fluoridated toothpaste was seen among 71.4%. Now, almost all toothpaste in developed countries is fluoridated. Under this legislation only 5% of drinking water supplies were fluoridated. Drinking water has not been fluoridated in any part of the Netherlands since 1973. Yet, further research shows no osteosarcoma risks from fluoridated water in humans. Hungary has not used artificially fluoridated water since then. In many cases water derived from bores is not fluoridated. Approximately 9% of the population of Northern Territory have naturally fluoridated water. Almost 71% of the population in 2002 resided in fluoridated communities. New Zealand now has fluoridated water supplied to about half of the total population. Currently, 40 countries have fluoridated water schemes implemented.