This is one of the rare instances where I agree with Trefoil's main point. that fluoride used in low concentrations in drinking water is not harmful. His crude insults though, and inability to substantiate and explain them are still frustrating though. There was no need to be rude to zstar.
To lay this issue to rest, here is an extract from the
World Health Organisation's Chemical Fact Sheets which explain the effects of fluoride, when it could become harmful, etc, here's the toxicology review:
Toxicological review
"Many epidemiological studies of possible adverse effects of the long-term ingestion of fluoride via drinking-water have been carried out. These studies clearly establish that fluoride primarily produces effects on skeletal tissues (bones and teeth). In many regions with high fluoride exposure, fluoride is a significant cause of morbidity. Low concentrations provide protection against dental caries, especially in children. The pre- and post-eruptive protective effects of fluoride (involving the incorporation of fluoride into the matrix of the tooth during its formation, the development of shallower tooth grooves, which are consequently less prone to decay, and surface contact with enamel) increase with fluoride concentration up to about 2mg/litre of drinkingwater; the minimum concentration of fluoride in drinking-water required to produce it is approximately 0.5 mg/litre. However, fluoride can also have an adverse effect on tooth enamel and may give rise to mild dental fluorosis at drinking-water concentrations between 0.9 and 1.2 mg/litre, depending on intake. Elevated fluoride intakes can also have more serious effects on skeletal tissues. It has been concluded that there is a clear excess risk of adverse skeletal effects for a total intake of 14mg/day and suggestive evidence of an increased risk of effects on the skeleton at total fluoride intakes above about 6mg/day."