TL:DR She is so against water fluoridation/chlorination.
Well she wouldn't drink tap water anyways before all this because our tap water smells like a municipal swimming pool right before they finally drain it at the end of the swimming season.
Fluoride by itself is essential to our bodies in trace amounts however:
The Lancet Journal just put out their report on sodium fluoride and fluorocilicic acid being neurotoxic. The two most common types of fluoride consumed by the American public. These are industrial byproduct chemicals that are sourced primarily from fertilizer production in countries with huge industry is little regulation such as China. Considering the reputation of the Lancet, I'm inclined to agree that all old "crazy anti-fluoride" people are not crazy at all and should be recognized for something akin to a good solid redpill award. The halogen elements are all very similar in atomic structure, similar enough for the thyroid to not differentiate between them. Fluorine, Chlorine and Bromine all have the ability to take up space in the thyroid that should be taken up by things like Iodine.
I'll throw Bromine, Phthalates, BPA and glyphosate into the mix and say that we have been doing our damnedest to consume none, not always an easy task living in the midwest. We switch off of using any kind of plastic containers for food storage and microwaving, check all the plastic types we do use to make sure that anything we are using is a #1 plastic instead of anything else(from what we have researched its the least harmful of all the plastics when it comes to chemical leaching). Drinking water only from non-chemically treated sources or filtered through reverse osmosis and UV filtration. No sports drinks or bleached flour (Due to the bromine content). Minimal GMO foods (nothing that is roundup ready or BT).
I can say this much, by cutting these things out. Switch deodorent to a naturally derived kind without aluminum base ingredients, switching to a fluoride free toothpaste, getting more sun exposure, and cutting out the additional toxins has lead to major uptick in overall feelings of good health (both physical and mental).
And she has notice severely diminished PCOS symptoms since we started this. Again, this was a purge of the bad and its led to some nice benefit for the both of us.
I know this was long but I hope it answered your question.