Research found in "Clinical Toxicology of Commercial Products"', 5th edition 1984, -lead has a toxicity rating of 3 which equals a moderate toxicity. Fluoride, more specifically sodium fluoride, the form of fluoride put into our water and toothpaste, has a toxicity rating of 4, which equals a very or high toxicity.
Warning labels on toothpaste, FDA mandates manufacturers using fluoride, "If you accidentally swallow more than used for brushing, seek professional help or contact a poison control center immediately.... They go on to say that consuming half of the tube your child loves the taste of can kill them.
Sodium and fluorosalicic acid fluoride are used in rat poison and insecticides. The only difference between rat poison and your toothpaste is the parts per million (ppm).
"U. S. Public Health Services" has stated that 50% of one's daily fluoride intake is eliminated, with the other 500,/0 being absorbed in calcified tissues such as the bone and teeth. They also state that fluoride makes the bones more brittle and the dental enamel more porous. Tragically, mottled teeth, also called dental fluorosis, affects 1 our of every 5 children in the U.S.
In the early part of the last century, fluoride was recognized as a dominant industrial pollutant. It was and still is a waste product from iron, steel, aluminum, copper, lead, and zinc manufacturing operations and is a by-product of fertilizer.
The promoters of toxic fluoride always state that fluoride is found in the earth and so it can't be harmful. Of course, they don't differentiate between their sodium fluoride and the natural, harmless calcium fluoride found in the earth.
In 1990, the "National Cancer Institute'" found and stated that commercial fluoride was carcinogenic. In 1992, they found a 6.9% increase in bone cancer was absolutely linked to fluoridated water. Other studies have revealed an increase in hip fractures, brain damage, osteoporosis, arthritis, and other abnormalities.
If you really want to know the history of fluoride, you should research I. G. Farben on the internet.