Deliberately damaging the thyroid will produce a plethora of symptoms affecting the entire human body from head to toe. Symptoms of thyroid damage and fluoride poisoning include weight gain, edema, kidney disease, kidney failure, hair loss, depression, aggression, aches, pains, skin problems, bone deformities (likely including "arthritis" and spontaneous fractures), sexual/erectile dysfunction, memory loss, weakness, fatigue, heart disease, irritability, cancer, digestive disorders including severe GERD as a result of swallowing fluoride, nausea, vomiting, visual problems, gum disease, "high cholesterol," connective tissue damage, brittle teeth, wrinkles, premature aging, dehydration, and long, long after the whole body has been damaged, "cosmetic fluorosis" might finally show up in a tooth or two. "Cosmetic fluorosis" is usually the only sign of fluoride poisoning mentioned by fluoride promoters, while downplaying the rest of the signs as though their livelihoods depended upon it.
Lethal fluoride doses cause death to occur by "natural causes" such as cardiac arrest, or acute renal failure or (for those who believe that cancer is a "natural cause" of death), by cancer. Fluoride binds to and possibly mimics calcium, but fluoride is a liar. The heart cells utilize a perfect balance of calcium and magnesium and other natural substances in the body's matrix to cause the heart to beat and then rest. Fluoride, bound to the calcium, confuses the normal functioning and cellular communication within the body, and causes arrhythmias.
The fluoride that is purchased by municipal waterworks and added into public drinking water is not even a "pharmaceutical grade" fluoride. It is primarily discarded waste, a slurry of toxins not wanted by the phosphate fertilizer mining corporations that sell it to waterworks. From there, it is then disposed of (sometimes by unskilled workers) into our drinking water. For those who have swallowed the propaganda that fluoride is "completely safe," and is some kind of a "nutrient" that is good for us, there is news footage available of a recent fluoride spill that took place in Illinois. A Hazmat team in protective gear was called in to clean up the mess, but not before the fluoride began eating through the concrete driveway it had spilled upon.