Sodium fluoride, a hazardous-waste by-product from the manufacture of aluminum, is a common ingredient in rat and cockroach poisons, anesthetics, hypnotics, psychiatric drugs, and military nerve gas. It's historically been quite expensive to properly dispose of, until some aluminum industries with an overabundance of the stuff sold the public on the terrifically insane but highly profitable idea of buying it at a 20,000% markup, injecting it into our water supplies, and then DRINKING it.
Yes, a 20,000% markup: Fluoride-- intended only for human consumption by people under 14 years of age--is injected into our drinking water supply at approx. 1 part-per-million (ppm), but since we only drink 1/2 of one percent of the total water supply, the rest literally goes down the drain as a free hazardous-waste disposal for the chemical industry, where we PAY them so that we can flush their expensive hazardous waste down our toilets. How many salesmen dream of such a deal? (Follow the money.)
Independent scientific evidence repeatedly showing up over the past 50 years reveals that fluoride allegedly shortens our life span, promotes cancer and various mental disturbances, accelerates osteoporosis and broken hips in old folks, and makes us stupid, docile, and subservient, all in one package. There are reports of aluminum in the brain possibly being a causative factor in Alzheimer's Disease, and evidence points towards fluoride's strong affinity for aluminum and also its ability to "trick" the blood-brain barrier by looking like the hydrogen ion, and thus allowing chemical access to brain tissue.