Hamilton residents have voted for fluoride to be returned to their water supply.
Newly released Hamilton City Council community referendum results show 23,000 people voted in favour of water fluoridation, and 10,000 voted against.
The overwhelming support did not surprise the Waikato District Health Board (DHB), which cited a previous fluoridation referendum in 2006 that returned similar results.
"The positive result is absolutely what we would have expected being that the decision to remove fluoride was lobbied by an active minority rather than the average ratepayer going about their business," Waikato DHB chief executive Craig Climo said.
The referendum result did not include votes from ratepayers in the south and west of the Waikato District, who also receive water from Hamilton City Council.