Fluoridation by country
Water fluoridation is the controlled addition of fluoride to a public water supply to reduce tooth decay, and is handled differently by country. Fluoridated water has fluoride at a level that is effective for preventing cavities; this can occur naturally or by adding fluoride. Fluoridated water operates on tooth surfaces: in the mouth it creates low levels of fluoride in saliva, which reduces the rate at which tooth enamel demineralizes and increases the rate at which it remineralizes in the early stages of cavities. Typically a fluoridated compound is added to drinking water, a process that in the U.S. costs an average of about $1.08 per person-year. Defluoridation is needed when the naturally occurring fluoride level exceeds recommended limits. In 2011 the World Health Organization suggested a level of fluoride from 0.5 to 1.5 mg/L (milligrams per litre), depending on climate, local environment, and other sources of fluoride. Bottled water typically has unknown fluoride levels.
Dental caries remains a major public health concern in most industrialized countries, affecting 60–90% of schoolchildren and the vast majority of adults. Water fluoridation reduces cavities in children, while efficacy in adults is less clear. A Cochrane review estimates a reduction in cavities when water fluoridation was used by children who had no access to other sources of fluoride to be 35% in baby teeth and 26% in permanent teeth. Most European countries have experienced substantial declines in tooth decay without its use. Recent studies suggest that water fluoridation, particularly in industrialized countries, may be unnecessary because topical fluorides (such as in toothpaste) are widely used and caries rates have become low.
Although fluoridation can cause dental fluorosis, which can alter the appearance of developing teeth or enamel fluorosis, the differences are mild and usually not considered to be of aesthetic or public-health concern. There is no clear evidence of other adverse effects from water fluoridation, as revealed by the York review from 2000. A 2007 Australian systematic review used the same inclusion criteria as York's, plus one additional study. This did not affect the York conclusions. Fluoride's effects depend on the total daily intake of fluoride from all sources. Drinking water is typically the largest source; other methods of fluoride therapy include fluoridation of toothpaste, salt, and milk. The views on the most effective method for community prevention of tooth decay are mixed. The Australian government states that water fluoridation is the most effective means of achieving fluoride exposure that is community-wide. The World Health Organization states water fluoridation, when feasible and culturally acceptable, has substantial advantages, especially for subgroups at high risk, while the European Commission finds no advantage to water fluoridation compared with topical use.
Currently about 372 million people (around 5.7% of the world population) receive artificially-fluoridated water in about 24 countries, including Australia, Brazil, Canada, Chile, Republic of Ireland, Malaysia, the U.S., and Vietnam. With 57.4 million people who receive naturally occurring fluoridated water at or above optimal levels in countries such as Sweden, China, Sri Lanka, Finland, Zimbabwe and Gabon. Community water fluoridation is rare in Continental Europe with 97–98% choosing not to fluoridate drinking water. Fluoridated salt and milk is promoted in some European countries instead. Water fluoridation has been replaced by other modes in many countries where water supplies are too decentralized for it to be a practical choice, or existing natural fluoride levels were already ample, including Germany, Finland, Japan, Netherlands, Sweden, Switzerland, Denmark and at a time Israel. Cessation of water fluoridation has been demonstrated in scientific studies such as a recent one in Calgary, Alberta, to result in increased rates of dental decay. While fluoridation can result in mild dental fluorosis, this effect is barely detectable and causes no concerns with the appearance or health of teeth. Countries practicing artificial water fluoridation vary in their recommended fluoride levels according to what health authorities in each have determined to be most effective for its citizens. The US recently reset the recommended optimal level of fluoride in drinking water, lowering it slightly, because of observed increased Fluorosis levels, likely due to additional fluoride sources like toothpaste and mouthwash which were not present when this level was originally set.
- 1 Africa
- 2 Asia
- 3 Europe
- 4 North America
- 5 Oceania
- 6 South America
- 7 References
Of Africa's 1.1 billion people, about 400,000 get artificially-fluoridated water (in Libya, data pre-2003).
Water is fluoridated in Egypt, with no recommended minimum value but with a maximum value of 0.4 mg/L.
Before 2003, 400,000 Libyans were receiving artificially-fluoridated water.
Only a fraction of Nigerians receive water from waterworks, so water fluoridation affects very few people. A 2009 study found that about 21% of water sources naturally contain fluoride to the recommended range of 0.3–0.6 ppm. About 62% have fluoride below this range.
South Africa's Health Department recommends adding fluoridation chemicals to drinking water in some areas. It also advises removal of fluoride from drinking water (defluoridation) where the fluoride content is too high.
Legislation around mandatory fluoridation was introduced in 2002, but has been delayed since then pending further research after opposition from water companies, municipalities and the public.
Approximately 947,000 (7% of the population) receives water with naturally occurring fluoride in it.
Roughly 2,600,000 (21% of the population) receives water with naturally occurring fluoride in it.
Fluoridation is banned in China. Naturally high fluoride levels in water are a serious problem in China. As of 2003, there is no water fluoridation in China. Water fluoridation began in 1965 in the urban area of Guangzhou. It was interrupted during 1976–1978 due to the shortage of sodium silico-fluoride. It was resumed only in the Fangcun district of the city, due to objections, and was halted in 1983. The fluoridation reduced the number of cavities, but increased dental fluorosis; the fluoride levels could have been set too high, and low-quality equipment led to inconsistent, and often excessive, fluoride concentrations.
All Hong Kong residents receive natural occurring fluoride in water, at about half the traditionally-recommended fluoride level. The Water Supplies Department fluoridates rainwater from 17 local reservoirs, in 21 treatment plants. Recent tests showed drinking water to have an average fluoride level of 0.48 mg/L, and a maximum of 0.69 mg/L.
Water fluoridation is not practiced in India. Due to naturally-occurring fluoride, both skeletal and dental fluorosis have been endemic in India in at least 20 states, including Uttarakhand, Jharkhand and Chhattisgarh. The maximum permissible limit of fluoride in drinking water in India is 1.2 mg/L, and the government has been obligated to install fluoride removal plants of various technologies to reduce fluoride levels from industrial waste and mineral deposits. Now reverse osmosis plants are widely used. Household and public system reverse osmosis plants are common in the market. Alleppey in Kerala is most affected with over-fluoridated water. Government-installed reverse osmosis plants supply free filtered water. Rotary International Club, Saratoga USA, helped to install 3 RO Plants in rural Alleppey.
As of 2014[update], there are 14,132 habitations in 19 States still containing fluoride above the permissible levels in drinking water. Rajasthan has the highest number of habitations (7,670) with high amount of fluoride in drinking water. Telangana has 1174, Karnataka has 1122 and Madhya Pradesh has 1055 habitation. Assam, Andhra Pradesh, Bihar, Chhattisgarh, Maharashtra, Odisha, West Bengal and Uttar Pradesh also has such habitations.
The government of India launched the National Programme for Prevention and Control of Fluorosis in 2008–2009. In 2013–2014, the programme was brought under the National Rural Health Mission, which has so far covered 111 districts. The programme includes surveillance of fluorosis in the community, training and manpower support, establishment of diagnostic facilities, treatment and health education. The Indian Council of Medical Research has formed a task force on fluorosis to address issues related to prevention and control.
Fluoride was required in water supplies nationwide by legislation passed in 2002, but the requirement was repealed in 2014, and artificial fluoridation was disparaged by national health officials, effectively ending the practice in Israel for a short while. After the election of 2015 the fluoridation program is to be re-debated the new deputy Health Minister Yaakov Litzman.
Mekorot, Israel's national water company states, "In the South of the country, it is unnecessary to add fluoride because it is found naturally in the water." Water fluoridation was introduced in Israel's large cities in 1981, and a national effort to fluoridate all the country's water was approved in 1988.
In 2002, the Union of Local Authorities (ULA) and others petitioned Israel's High Court to stop the Health Ministry from forcing cities to implement water fluoridation. The court soon issued a restraining order, but after half a year ULA withdrew its petition upon the request of the court.
By 2011, about 65% of the municipalities and local authorities in Israel had agreed to allow fluoridation, and there was active opposition to the spread of fluoridation to the towns where it has not yet been instituted. In 2011, the Health and Welfare Committee of the Knesset criticized the Health Ministry for continuation of water fluoridation.
On 26 August 2014, Israel officially stopped adding fluoride to its water supplies. According to a Ministry of Health press release statement, the reasons it ended water fluoridation were: "Only some 1% of the water is used for drinking, while 99% of the water is intended for other uses (industry, agriculture, flushing toilets etc.). There is also scientific evidence that fluoride in large amounts can lead to damage to health. When fluoride is supplied via drinking water, there is no control regarding the amount of fluoride actually consumed, which could lead to excessive consumption. Supply of fluoridated water forces those who do not so wish to also consume water with added fluoride." Many in the medical and dental communities in Israel criticized the decision as a mistake.
The first community water fluoridation programme was in Kyoto prefecture in 1952, lasting 13 years. The second was established by US military authorities in Okinawa prefecture in 1957, lasting 15 years. The last experience was in Mie Prefecture in 1967, lasting 4 years.
Less than 1% of Japan practices water fluoridation. Instead, as of March 2010, a total of 7,479 schools and 777,596 preschool to junior high school children were participating in school-based fluoride mouth-rinsing programme (S-FMR), with an estimate of 2,000,000 children participating in 2020.
In 2005, the ruling Uri Party proposed legislation for compulsory water fluoridation for municipalities. The legislation failed, and only 29 out of around 250 municipal governments had introduced water fluoridation at that time. Fluoridation was proposed again in 2012.
In 1998, 66% of Malaysians were getting fluoridated water.
In 2010, Bernama reported, "Principal Director (Oral Health) in the Health Ministry, Datuk Dr Norain Abu Taib said that only 75.5% of the country's population are enjoying the benefits of water fluoridation".
In 1956, Singapore was the first Asian country to institute a water fluoridation program that covered 100% of the population. Water is fluoridated to a typical value of 0.4-0.6 mg per litre.
Out of a population of about three-quarters of a billion, under 14 million people (approximately 2%) in Europe receive artificially-fluoridated water. Those people are in the UK (5,797,000), Republic of Ireland (4,780,000), Spain (4,250,000), and Serbia (300,000).
The first water fluoridation in Europe was in West Germany and Sweden in 1952, bringing fluoridated water to about 42,000 people. By mid-1962, about 1 million Europeans in 18 communities in 11 countries were receiving fluoridated water.
Many European countries have rejected water fluoridation, including: Austria, Belgium, Finland, France, Germany, Hungary, Luxembourg, Netherlands, Northern Ireland, Norway, Sweden, Switzerland, Scotland, Iceland, and Italy. A 2003 survey of over 500 Europeans from 16 countries concluded that "the vast majority of people opposed water fluoridation".
Austria has never implemented fluoridation.
Belgium does not fluoridate its water supply, although legislation permits it.
Czech Republic (previously Czechoslovakia) started water fluoridation in 1958 in Tábor. In Prague fluoridation started in 1975. It was stopped in Prague in 1988 and subsequently in the whole country. Since 2008 no water has been fluoridated. Fluoridated salt is available.
Croatia does not fluoridate its water.
Denmark has released test results for levels of various water contaminants, including fluoride, in the drinking water of some cities: København, Brøndby, Albertslund, Dragør, Hvidovre, Rødovre, Vallensbæk, and Herlev.
Kuopio is the only community in Finland with at least 70,000 people that has ever had water fluoridated. Kuopio stopped fluoridation in 1992. In regions with rapakivi bedrock (small, but densely populated regions), 22% of well waters and 55% of drilled well waters exceed the legal limit of 1.5 mg/l; generally, surface and well waters have 0.5-2.0 mg/l fluoride in affected regions.
Public drinking water supplies are not currently fluoridated in any part of Germany, however for children and adolescents use of fluoridated salt and toothpaste, as well as fluoride tablets and washes is strongly encouraged by the German Ministry of Health.
Kassel-Wahlershausen in West Germany became the second location in Europe where water fluoridation was practiced in 1952. By 1962, no other part of the FRG was fluoridating, and Kassel-Wahlershausen discontinued the practice in 1971.
In the GDR (East Germany) in the late 1980s, about 3.4 million people (20%) were receiving water with added fluoride. Fluoride tablets were also provided. The fluoridated areas of the GDR included the towns of Karl-Marx-Stadt (now Chemnitz), Plauen, Zittau, and Spremberg. Children in those towns were part of large long-running studies of caries prevalence. A fluoride cessation study found that consistent with a previously observed population-wide phenomenon that the rate of cavities continued to drop after the fluoride concentration in water fell from the augmented 1.0 ppm to its natural level below 0.2 ppm. Water fluoridation was discontinued after the German reunification.
There is no water fluoridation in Greece.
In the early 1960s the city of Szolnok briefly fluoridated its water. The program was discontinued due to technical problems and a public view that fluoridation did not seem reasonable.[clarification needed] Hungary has not used artificially fluoridated water since then.
The Republic of Ireland is the only European country with a policy of mandatory water fluoridation. Worldwide, the Irish Republic and Singapore are the only countries which implement mandatory water fluoridation. 
The majority of drinking water in the Republic, (but not Northern Ireland), is fluoridated. In 2012, roughly 3.25 million people received artificially-fluoridated water. Almost 71% of the population in 2002 resided in fluoridated communities. The fluoridation agent used is hydrofluorosilicic acid (HFSA; H2SiF6). In a 2002 public survey, 45% of respondents expressed some concern about fluoridation.
In 1957, the Department of Health established a Fluorine Consultative Council which recommended fluoridation at 1.0 ppm of public water supplies, then accessed by approximately 50% of the population. This was felt to be an effective way of preventing tooth decay, in an era before fluoridated toothpaste was commonly used. This led to the Health (Fluoridation of Water Supplies) Act 1960, which mandated compulsory fluoridation by local authorities. The statutory instruments made in 1962–65 under the 1960 Act were separate for each local authority, setting the level of fluoride in drinking water to 0.8–1.0 ppm. The current regulations date from 2007, and set the level to 0.6–0.8 ppm, with a target value of 0.7 ppm.
In 1960, the Fianna Fáil minister for health, Seán MacEntee, brought forward the Health (Fluoridation of Water Supplies) Act and a Dublin housewife Gladys Ryan challenged the Act as an “invasion of family rights”. Ryan lost the case, which lasted 65 days, at the High Court (Ireland), and appealed to the Supreme Court. Ryan was represented in court by Seán MacBride who argued that fluoridation was an infringement of human rights since people had no option but to drink it. Ryan’s lawyers, including Richie Ryan (politician) worked on a pro bono basis and expenses were paid by fundraising. In 1965, the Supreme Court rejected Gladys Ryan's appeal that the Act violated the Constitution of Ireland's guarantee of the right to bodily integrity.
By 1965, Greater Dublin's water was fluoridated; by 1973, other urban centers were too. Studies from the late 1970s to mid 1990s showed a decrease in (and lower incidence of) dental decay in school children living in areas where water was fluoridated than in areas where water was not fluoridated. The government of the Republic of Ireland has yet to carry out a public health survey on the effects of fluoridation, even though this is required to under the 1960 Health (Fluoridation of Water Supplies) Act.
A private member's bill to end fluoridation was defeated in the Dáil on 12 November 2013. It was supported by Sinn Féin and some of the technical group and opposed by the Fine Gael-Labour government and Fianna Fáil.
There is much local government opposition to compulsory fluoridation, legally mandated nationwide by Dáil Éireann. Early in 2014, Cork County Council and Laois County Council passed motions for the cessation of water fluoridation. In Autumn 2014, Cork City Council, Dublin City Council and Kerry County Council passed similar motions. 
Fine Gael was opposed to compulsory water fluoridation but they now support the policy. Fianna Fail is in favour of compulsory water fluoridation and in 2004 Micheal Martin set up the pro-fluoride Irish Expert Body on Fluorides and Health. 
There is no water or food fluoridation in Italy. Except for isolated locations near volcanos or polluters, fluoride in water is low across the country.
Water was fluoridated in large parts of the Netherlands from 1960 to 1973, when the High Council of The Netherlands declared fluoridation of drinking water unauthorized. Dutch authorities had no legal basis for adding chemicals to drinking water if they would not contribute to a sound water supply. Drinking water has not been fluoridated in any part of the Netherlands since 1973.
In 2000, representatives of the Norwegian National Institute for Public Health reported that no cities in Norway were practicing water fluoridation. There had been intense discussion of the issue around 1980, but no ongoing political discussion in 2000.
About 300,000 people in Serbia (3%) were receiving fluoridated water before 2003.
In 1952, Norrköping in Sweden became one of the first cities in Europe to fluoridate its water supply. It was declared illegal by the Supreme Administrative Court of Sweden in 1961, re-legalized in 1962 and finally prohibited by the parliament in 1971, after considerable debate. The parliament majority said that there were other and better ways of reducing tooth decay than water fluoridation. Four cities received permission to fluoridate tap water when it was legal.:56–57 An official commission was formed, which published its final report in 1981. They recommended other ways of reducing tooth decay (improving food and oral hygiene habits) instead of fluoridating tap water. They also found that many people found fluoridation to infringe upon personal liberty/freedom of choice by forcing them to be medicated, and that the long-term effects of fluoridation were insufficiently acknowledged. They also lacked a proper study on the effects of fluoridation on formula-fed infants.:29 In the year 2004 the allowed amount of fluoride in the water was decreased to 1,5 mg/l.
In Switzerland, since 1962, two fluoridation programs had operated in tandem: water fluoridation in the City of Basel, and salt fluoridation in the rest of Switzerland (around 83% of domestic salt sold had fluoride added). However it became increasingly difficult to keep the two programs separate. As a result, some of the population of Basel were assumed to use both fluoridated salt and fluoridated water. In order to correct the situation, in April 2003 the Grand Council of Basel-Stadt resolved to cease water fluoridation and expand salt fluoridation to Basel.
Around 10% of the population of the United Kingdom receives fluoridated water. About half a million people receive water that is naturally fluoridated with calcium fluoride, and about 6 million total receive fluoridated water. The Water Act 2003 required water suppliers to comply with requests from local health authorities to fluoridate their water.
The following UK water utility companies fluoridate their supply:
- Anglian Water Services Ltd
- Northumbrian Water Ltd
- South Staffordshire Water plc
- Severn Trent plc
- United Utilities Water plc
Earlier plans were undertaken in the Health Authority areas of Bedfordshire, Hertfordshire, Birmingham, Black Country, Cheshire, Merseyside, County Durham, Tees Valley, Cumbria, Lancashire, North, East Yorkshire, Northern Lincolnshire, Northumberland, Tyne and Wear, Shropshire, Staffordshire, Trent and West Midlands South whereby fluoridation was introduced progressively in the years between 1964 and 1988.
The South Central Strategic Health Authority carried out the first public consultation under the Water Act 2003, and in 2009 its board voted to fluoridate water supplies in the Southampton area to address the high incidence of tooth decay in children there. Surveys had found that the majority of surveyed Southampton residents opposed the plan, but the Southampton City Primary Care Trust decided that "public vote could not be the deciding factor and that medical evidence shows fluoridation will reduce tooth decay – and failed to back up claims of serious negative side effects". Fluoridation plans have been particularly controversial in the northwest of England and have been delayed after a large increase on projected costs was revealed. In October 2014, Public Health England abandoned plans for water fluoridation for 195,000 people in Southampton and neighbouring parts of south-west Hampshire due to opposition from both Hampshire County Council and Southampton City Council.
It was reported in 2007 that the UK Milk Fluoridation Programme, centered in the northwest of England, involved more than 16,000 children.
The water supply in Northern Ireland has never been artificially fluoridated except in two small localities where fluoride was added to the water for about 30 years. By 1999, fluoridation ceased in those two areas, as well.
In 2004, following a public consultation, Scotland's parliament rejected proposals to fluoridate public drinking water.
The decision to fluoridate lies with local governments, with guidelines set by provincial, territorial, and federal governments. Brantford, Ontario, became the first city in Canada to fluoridate its water supplies in 1945. In 1955, Toronto approved water fluoridation, but delayed implementation of the program until 1963 due to a campaign against fluoridation by broadcaster Gordon Sinclair. The city continues to fluoridate its water today. In 2008 the recommended fluoride levels in Canada were reduced from 0.8–1.0 mg/L to 0.7 mg/L to minimize the risk of dental fluorosis. Ontario, Alberta, and Manitoba have the highest rates of fluoridation, about 70–75%. The lowest rates are in Quebec (about 6%), British Columbia (about 4%), and Newfoundland and Labrador (1.5%), with Nunavut and the Yukon having no fluoridation at all. Overall, about 45% of the Canadian population had access to fluoridated water supplies in 2007. A 2008 telephone survey found that about half of Canadian adults knew about fluoridation, and of these, 62% supported the idea.
In 2010, the Region of Waterloo held a non-binding referendum for residents to decide whether water fluoridation should continue. The result of the vote was 50.3% voting against fluoridation. The regional council honored the vote, and over forty years of fluoridation in the city of Waterloo ended in November.
In 2011, Calgary city council voted 10–3 to stop adding fluoride to the city's drinking water, having started water fluoridation in 1991. A research project has been planned to study the effects of Calgary's cessation, using Edmonton as a control.
On 28 January 2013, Windsor city council voted 8–3 to cease fluoridation of Windsor's drinking water for five years, honoring a February 2012 recommendation by the Windsor Utilities Commission. Tecumseh gets its water from Windsor, and Tecmuseh's council had voted on 13 March 2012 to ask Windsor to stop fluoridating. Money formerly spent on fluoridation was reallocated to oral health and nutrition education programs. Windsor's water had been fluoridated for over fifty years.
On 14 December 2018, Windsor city council voted 8–3 to reintroduce fluoridation of Windsor's drinking water. According to the Oral Health 2018 report released by the health unit, the percentage of children with tooth decay or requiring urgent care has increased by 51 per cent in 2016-17 compared to 2011-12.
Mexico has no water fluoridation program; instead it has a table salt fluoridation program.
As of May 2000, 42 of the 50 largest U.S. cities had water fluoridation. In 2010, 66% of all U.S. residents and 74% of U.S. residents with access to community water systems receive fluoridated water. In 2010, a U.S. Centers for Disease Control and Prevention study determined that "40.7% of adolescents aged 12–15 had dental fluorosis [in 1999–2004]". In response, the U.S. Department of Health and Human Services together with the U.S. Environmental Protection Agency are proposing to reduce the recommended level of fluoride in drinking water to the lowest end of the current range, 0.7 milligrams per liter of water (mg/L), from the previous recommended maximum of 0.7 to 1.2 mg/L in recognition of the increase in sources of fluoride such as fluoridated toothpastes and mouthwashes This could effectively terminate municipal water fluoridation in areas where fluoride levels from mineral deposits and industrial pollution exceed the new recommendation.
Australia now provides fluoridated water for 70% or more of the population in all states and territories. Many of Australia's drinking water supplies began fluoridation in the 1960s and 1970s. By 1984 almost 66% of the Australian population had access to fluoridated drinking water, represented by 850 towns and cities. Some areas within Australia have natural fluoride levels in the groundwater, which was estimated in 1991 to provide drinking water to approximately 0.9% of the population.
The first town to fluoridate the water supply in Australia was Beaconsfield, Tasmania in 1953. Queensland became the last state to formally require the addition of fluoride to public drinking water supplies in December 2008.
The use of water fluoridation first began in New Zealand in Hastings in 1954. A Commission of Inquiry was held in 1957 and then its use rapidly expanded in the mid 1960s. New Zealand now has fluoridated water supplied to about half of the total population. Of the six main centers, only Christchurch and Tauranga do not have a fluoridated water supply. Wellington's water supply is mostly fluoridated, but the suburbs of Petone and Korokoro receive a non-fluoridated supply. In Auckland, the suburbs Onehunga and Huia Village don't fluoridate water.
In 2013, a Hamilton City Council committee voted to remove fluoride from late June 2013. A referendum was held during the council elections in October 2013 with approximately 70% of voters voting for fluoride to be added back into the water supply, and in March 2014, the council voted 9 to 1 to re-introduce fluoride into the supply. In a 2007 referendum about half of voters in the Central Otago, South Otago and the Southland Region did not want fluoridation and voters in the Waitaki District were against water fluoridation for all Wards. Ashburton and Greymouth also voted against fluoridation.
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By 2008, 41% of people (73.2 million) in Brazil were getting artificially-fluoridated water.
Water fluoridation was first adopted in Brazil in the city of Baixo Guandu, ES, in 1953. A 1974 federal law required new or enlarged water treatment plants to have fluoridation, and its availability was greatly expanded in the 1980s, with optimum fluoridation levels set at 0.8 mg/L. Today, the expansion of fluoridation in Brazil is a governmental priority; Between 2005 and 2008, fluoridation became available to 7.6 million people in 503 municipalities. As of 2008, 3,351 municipalities (60.6%) had adopted fluoridation, up from 2,466 in 2000.
In Chile 70.5% of the population receives fluoridated water (10.1 million added by chemical means, 604,000 naturally occurring). The Biobio Region is the only administrative division that doesn't fluoridate water.[unreliable source?]
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