The fluoride added to drinking water and toothpaste is a Crude Industrial Waste Product of the aluminum and fertilizer industries, and a substance toxic enough to be used as rat poison.
Try telling that to most Americans, even with shown evidence and proof. They will deny it and even combat with you to prove you wrong.
They refuse to give up their poison. Little do they know how the western medical mafia was created, those experts they trust?
One can thank their government for that. The marketing of fluoride has been one the biggest campaign psyops (called doublethink) on the American populous.
Most dentists have no clue because they too only know what their government indoctrination centers told them know. So you have a poisoned populous too sick and weak to care and too dumbed down to figure it out.