@Gary66:  Right on target, as is Denby with this article.  Also in my 70's, I drank flouridated water for the first 50+ years of my life until moving to Hawaii.  I have rock-hard teeth as my dentist will attest.  Genes and diet are also factors, although my parents both had mouths filled with gold.  They did not have flouride until I was a child old enough to remember the change.  

My sibs and I did get gallons of milk...my Dad, paying the bills, used to complain about his family of calves...and we were never allowed regular access to sugary, carbonated beverages.  I have witnessed modern parents giving the kids in diapers soft drinks   Little wonder they have lousy teeth.