Fluoride may not be necessary in water to help prevent cavities. Scientific studies are now showing it may be an outdated idea. The process to put fluoride in water began in 1945 in Grand Rapids, Michigan and from there spread nationwide.
A group of researchers and doctors have begun to study the effectiveness of fluoride fighting tooth decay. After extensive studies they came up with the result that fluoride does not have a statistically significant degree of effectiveness to reduce tooth decay. These same studies showed no sound success in baby teeth having reduced cavities when fluoride was used in their oral treatments. Their studies do not support the use of fluoride in water, which Adam Sender found pretty informative.
In a second community where fluoride use continued the cavity rates remained stable.