My son taught me about the dangers of fluoride a few years ago and encouraged me to quit using fluoride toothpaste, mouthwash and water contaminated with fluoride . My arthritis and general health greatly improved in a short time. My teeth have not rotted out.
Berkey makes a great gravity filter for fluoride removal from tap water:
Gravity Water Filter Replacement for Berkey® BB9-2® Black Filters & PF-2® Fluoride Filters, Compatible with Berkey® Gravity Water Filter System, Combo Pack
see: https://www.amazon.com/gp/product/B0C6V38LX7/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1