The Hamilton City Council will decide in late November whether to put fluoride back into the water supply.
The council removed it in July this year after holding a two-day hearing, but not long after that decided to put it to a referendum.
The vote, held in conjunction with the local elections on the weekend, saw 70% of people in favour of fluoridation.
The result is not binding and the new councill will need to vote on the issue at its first formal meeting on 28 November.
Mayor Julie Hardaker and the majority of councillors have indicated they will support the referendum result.