Ken Evans, who campaigned against the addition of fluoride to Tauranga's water supply in the 1990s, said in his view giving the decision to the health board was taking away voters' democratic rights.
"Here we have a National government which believes in democracy, which believes in personal effort for getting ahead. And now we have a minister proposing to take over an issue and force it on a community by taking away our democratic rights. That is absolutely disgraceful."
Dr Coleman said New Zealand had high rates of preventable tooth decay and increasing access to fluoridated water would improve oral health. A bill was expected to be introduced to Parliament later this year.