Fluoridation has been recommended for all Australian adults since 1992, but some patients have expressed concerns over potential side effects and the need to get additional treatment.

In February, Australia’s health minister, Catherine King, said the government had seen “increased uptake” of the controversial medicine in recent years and that the government would continue to monitor the safety of fluoridation.

The World Health Organization said in 2015 that fluoridation was safe and effective, but said it was not yet clear if there was enough evidence to recommend it as a treatment for flu.

The American Association of Retired Persons (AARP) said that the use of fluoride in the U.S. was already “very common”, but that there was no evidence that it was harmful to children.

It also said that, in its report on the health effects of fluoride, the American Academy of Pediatrics noted that the evidence “has not been conclusive” on its use.