alt Hacker NewsFluoride doesn't bio-accumulate like PFAS do, which has a strong affinity for proteins and fats in organisms. Constantly drinking water with 0.5-1 ppm fluoride may cause minor side effects like mild dental fluorosis, but you'll excrete almost all the excess as it's very water soluble. Drink water with any PFAS, and your body will strongly hold on to it all.
"0.5-1 ppm" covers what's considered the optimum level of fluoride in drinking water, so I doubt you'd get dental fluorosis from that. Coincidentally, if you calculate the equivalent dose that you'd give babies (via dissolved vitamin D + fluoride tablets), you also end up at about 0.3-0.5ppm.