Cutting your teeth on Ireland's dental service   Ireland is the only country that mandates fluoridation country-wide. Yet, up to half of children in Ireland have tooth decay by the age of five

“After the advent of fluoride in water and fluoride in toothpaste it seemed we had a good lid on caries [tooth decay or a cavity],” she says. But over the past 10 years that appears to have changed for the worse, which she attributes to the modern diet and a change in child-rearing practices.