On the 9th April 2024 an Injunction against the Hastings District Council was filed in the High Court in Wellington. See  Fluoride Free New Zealand and New Zealand Doctors Speaking Out With Science take legal action against Hastings District Council over Fluoridation.

New Health New Zealand has taken a case against the Director-General of Health regarding the legality of the Directives sent by the Director-General to 14 councils. A point of clarification was made in November 2023 that found the directives were unlawful. See our page New Health New Zealand vs Director-General of Health for details.

Fluoride Action Network (USA) have sued the US Environmental Protection Agency for failing to do a risk assessment on fluoridation, as may be required under the Toxic Substances Control Act.  See US Fluoridation Trial.