Sodium fluoride added to the water decreases your IQ by 10-20 points, Increases your chances of getting bone cancer, weakens the bones of children and elderly leading to fractures.
Fluoride is a cumulative poison. On average, only 50% of the fluoride we ingest each day is excreted through the kidneys. The remainder accumulates in our bones, pineal gland, and other tissues. If the kidney is damaged, fluoride accumulation will increase, and with it, the likelihood of harm.
Fluoride is not an essential nutrient. No disease has ever been linked to a fluoride deficiency. Humans can have perfectly good teeth without fluoride.
if your on city water find out if sodium fluoride is added to the water.