The Far North District Council agreed to fluoridate Kaitaia and Kaikohe water for two years, on what it understood was a trial basis.
The Northland District Health Board has applied to continue the measure for another two years.
But the council says it was expecting some results from the trial, before consulting the community about whether to continue.
However the health board has no results yet and says its study is not about proving the effectiveness of fluoridation.
The council will not now resume fluoridation until it has consulted the community.
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