Carterton District Council voted to keep fluoride out of the town's water supply at its monthly meeting on Wednesday.
This comes after Wairarapa District Health Board made a recommendation to the council that water fluoridation should be utilised.
"There is no doubt in the board's mind that water fluoridation is safe and effective in helping with oral health for all, but especially for your children and most vulnerable communities."
It went on to encourage each council to fluoridate their water.
"Local drinking-water supplies that are already fluoridated should remain so. Where technically feasible, where local supplies are not fluoridated, local authorities are encouraged to implement water fluoridation programmes as soon as possible to improve the oral health of their communities."