Even if you use a fluoride-free toothpaste, you are most like still being exposed to fluoride in some shape or form. If it's in your municipality's water supply, you're taking in fluoride, even if it's filtered. I did some research on water filters for pitchers, and also filters on faucets. Those filters do NOT remove fluoride. And a lot of bottled water has been third-party tested, and the results mostly showed fluoride is in that water also.