Some say fluoride helps CHILDREN’S teeth as they form. That is certainly questionable, but: 
It is important to ask --- exactly why should an ADULT be sentenced to take this toxic chemical, fluoride, in every glass of water every day of life?

Fluoridation results in slow poisoning over a lifetime which causes premature ageing, thyroid damage, dental fluorosis, lowered IQ, ADHD, brittle bones (broken hips & arthritis), kidney damage, cancer and other health dangers. 
Read this excellent book, "The Case Against Fluoride" authored by three scientists, one an M.D. It contains over 1200 scientific references, over 80 pages.

So, while 74% of the U.S. is forced to drink fluoridate water, only 5% of the world and only 3% of Europe fluoridate their water. China and Japan have rejected it many years ago.