Latest figures from the New Zealand's own Ministry of Health show that non-fluoridated areas have healthier teeth than fluoridated areas. They don't advertise this, but we at Fluoride Free NZ try to :)
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I'm not familiar with those cities, go you have a graph to compare poverty rates in those cities?
Most of the country is represented in this graph. Socio-economic information about New Zealand is readily available online. Google is your friend.
These kind of stats are shown around the globe. You're onto it though- dental decay is about poverty, it's not about fluoridation in the water.
http://www.newsweek.com/fluoridation-may-not-prevent-cavities-huge-study-shows-348251
that huge study seemed to have excluded most studies from consideration