[tredre3]

> And it happens when you're growing your permanent teeth when your parents forget to teach you

He said it happened as he grew up. Wikipedia says almost half of Americans have at least mild fluorisis, there's no need to blame the parents when an environmental/governmental cause is so readily established...

> Also, fluorosis is a cosmetic issue

That's what I thought too but Wikipedia also disagrees on this count:

The pits, bands, and loss of areas of enamel seen in severe fluorosis are the result of damage to the severely hypomineralized, brittle and fragile enamel which occurs after they erupt into the mouth.