Oregon

It applies fluoride in too great concentration, which makes the enamel brittle and subject to fracturing. The effect doesn't show up for years, but has been clearly established. When my family moved from an area which was fluoridated to one which was not my parents had the topical application done on my teeth. I have had four molars shatter when I was in my late 50's and 60's, all four of which were cavity-free. My dentist was mystified until he asked if I'd had topical fluoride application and I told him I had. He said that explained the breakage of my teeth and said that is why he favors its inclusion in drinking water.