Fluoride in water
... On top of that, it is as simple as adding a little fluoride to the public water supplies of a community. Fluoride should be added to the drinking water of communities for the simple facts that it has been a cornerstone of cavity prevention in the United States, it has benefits everyone regardless of socioeconomic level, it has been listed as one of the top ten great public health achievements of the twentieth century, and it is also highly cost effective. ... Small amounts of flouride can be found in all water sources, there are also varying amounts of flouride found in all food and beverages. ... Most dentists also credit water flouridation for the fact that half of the children ages 5 to 17 have never experienced a cavity in their permanent teeth.