Here's a link to Wikipedia which shows water fluoridation by country:

Wikipedia: Fluoridation by Country

I found the Israel one particularly interesting:

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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."[17] 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.[18]

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,[19][20] but after half a year ULA withdrew its petition upon the request of the court.[21]

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.[18] In 2011, the Health and Welfare Committee of the Knesset criticized the Health Ministry for continuation of water fluoridation.[22]

In 2013 the new Minister of Health Yael German has signed a new regulation setting water quality and not requiring fluoridation, that will take effect in the following year. She has insisted that it was better to provide fluoride in other ways to “target audiences” such as poor children, who were unlikely to brush their teeth regularly with fluoride toothpaste. “It must be known to you that fluoridation can cause harm to the health of the chronically ill and pregnant women,” German wrote in the letter. She argued that only 2% of water is used for drinking by the population, with the rest used for dishwashing, bathing, industry and other uses."[23][24]

On May 5, 2013, the Israeli Supreme Court ruled to ban all water fluoridation as of 2014.[25]

Why, I wonder?