Residents opposed to the fluoridation of the Isle of Man water supply are mounting a public campaign.
It would cost £150,000 to fluoridate the island's water supplies
Health and Social Security Minister Eddie Teare announced in February that residents would be consulted on the issue over a 12-month period.
Supporters say fluoridation can help to cut tooth decay, though opponents say fluoride can cause a range of problems, from tooth mottling to cancer.
A public meeting is being held at the Loch Prom Church on Friday evening.
There are no plans at present to introduce the chemical into island supplies, but this could change if feedback is positive.
It would cost £150,000 to fluoridate the water supply and the government has said the cost would not be passed on through water rates.
Fluoride is present naturally in most water supplies - but usually not at levels which are beneficial for dental health.
Currently, six million people in the UK - including the Midlands, Newcastle and the North East - receive fluoridated water supplies.