His comments follow Hamilton City Council decision to removefluoride from its water supply.
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A member of the New Zealand Dental Association says councils that removefluoride from water supplies are jeopardising children's dental health.
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In December 2014, Evans travelled to Western Australia to meet with the group Fluoride Free, which campaigns to removefluoride from drinking water.
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Distillation and reverse osmosis are the only two reliable methods for removingfluoride.
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Earlier this month, the campaigners scored a major victory when Dublin city councillors voted in favour of removingfluoride from Ireland's public water supplies.