Here’s a shocker: boiling water does NOT remove fluoride. In fact, it makes the concentration higher because water evaporates but fluoride stays. Oops! So don’t waste your gas bill trying that.
But wait—there’s a cheap alternative that actually works: let your water sit out overnight. Yep, it’s called the “open-air evaporation” method. Fluoride is a gas in water, and some of it will escape if you leave the container uncovered for 12–24 hours. It’s not perfect, but it’s free.
