Labour has promised to hold an inquiry into the divisive issue of adding fluoride to drinking water supplies to prevent tooth decay.
The Ministry of Health, serving both Labour and National administrations, has long advocated fluoridation as a "safe, effective and affordable way to prevent and reduce tooth decay across the whole population".
More than half of New Zealanders live in areas of fluoridated water supplies, but it is up to local councils to decide whether to add the chemical, and some are turning against the practice. Last month, the New Plymouth District Council voted to cease fluoridation.
In its health policy, released yesterday, the Labour Party said that in government it would "hold an independent inquiry into the fluoridation of drinking water, with a view to developing a national policy on fluoridation as a national dental health measure".
Health spokesman Grant Robertson said he personally supported fluoridation.