While obviously it's important to consume as little of this neurotoxin as possible, we also have to bear in mind humans have been drinking tea (high source of flouride) for thousands of years and generally regarded it as safe in reasonable quantities daily.
The difference between then and now is MELATONIN. One of the dangers of fluoride it that it builds up in the pineal gland and reduces melatonin secretion and less melatonin means more damage to mitochondrial function and less protection from oxidative stress.
MELATONIN does help protect from the fluorosis so we should be supplementing with melatonin if we are obliged to drink fluorinated water and we should be paying attention to sleep hygiene (keeping bedrooms dark at night) getting bright light exposure daytime, using free FLUX on our PC monitor.
PROTECTIVE EFFECT OF CURCUMIN AND QUERCETIN ON THYROID
FUNCTION IN SODIUM FLUORIDE INTOXICATED RATS
Curcumin supplementation protects from genotoxic effects of arsenic and fluoride. Food Chem. Toxicol. (2010), doi:10.1016/j.fct.2010.02.015
these are what I use
Source Naturals, Meriva Turmeric Complex, 500 mg, 120 Tablets
Our price: $26.87 (£17.62)
I buy from Iherb because shipping to UK cheapest. Code WAB666 saves $5 initially and other discounts are available. US/Canadian readers may find google/amazon turns up cheaper option depending on shipping/discounts available.
Natrol, Melatonin TR, Time Release, 3 mg, 100 Tablets : $5.10 (£3.34)