Hamilton ratepayers can have their say about whether their water should contain fluoride in a referendum later this year.
Hamilton City Council on Friday voted seven to six , to hold a referendum in conjunction with the elections in October.
In June, the council voted to stop adding fluoride to its water supply.
Councillor Ewan Wilson initiated the discussion through a petition which gained more than 2000 signatures from the community and said Friday's vote was about running an effective democracy and allowing people to have their say.
Cr Wilson said fluoride has not been added to the water for about 2½ weeks.