"I've asked the authorities to look at how they can better convey both the health benefits and the social benefits of fluoridation in such a way that people can appreciate those benefits and be aware of them," he said.
In the run-up to local body elections some regions will hold a referendum on the issue, Mr Ryall said.
"I think communities need to be aware there will be highly organised campaigns of misinformation. "There will be people who come from out of town and tell all sorts of shock-horror stories around fluoridation."
Communities should look to their local district health boards, dentists and the evidence which showed fluoridation in New Zealand was safe and benefited families, Mr Ryall said.
APNZ