Please do your own research, as this is a very controversial subject which has been fought since its inception, with entrenched opinions. Here's a primer:
- Too much fluoride is bad for humans, and the threshold can achieved with a standard diet and recommended intake of water, assuming fluoridated water is used for both consumption and food prep. This excludes fluoride toothpaste.
- Fluoride can not be removed from tap water using standard water filters, or even R/O filters. Removal requires highly specialized filters which utilize aluminum to chemically un-bind the fluoride, which then require a separate filtration statge to remove the aluminum.
- This is because fluoride creates some of the strongest chemical bonds, and is the reason it is the primary component in PFAS, or "forever chemicals"
- Very little of our tap water actually touches human teeth.
- Fluoride is a problematic byproduct of the production of aluminum and fertilizer industry.
- Buildup of fluoride in urban/suburban soils is becoming a crop & gardening concern for which there is no viable solution.
- Fluoride tablets were administered as a remedy for hyper-thyroidism, as it decreased thyroid function. Fluoride is believed to be a factor in the increase of modern hypo-thyroid ailments
- Fluoride is a known carcinogen.
- Fluoride is a known neurotoxin, shown to reduce IQ - particularly for children. Many pediatricians advise against fluoride toothpaste at young ages.
Most of the research done on fluoridating tap water was done in the early 1940s & 50s, well in advance of modern dental hygiene and fluoridated toothpaste use. Studies do definitively show applying fluoride directly to teeth does strengthen tooth enamel, but modern studies are mixed, at best, regarding efficacy of fluoridated tap water between equivalent socioeconomic communities. No studies have been conducted regarding dermal absorption of fluoride , believed to further elevate intake.
I think the simplest solution is to let people choose for themselves, and add fluoride to their personal drinking water if that's what they choose.
We don't need to fluoridate water in our toilets, showers, or irrigation.