Weed killer could do alot of good, flouride as well. Weed killer is expensive for many families, and it seems to me that in only a few years we should be able to get glyphosate resistant genes into people. We would become a beautiful nation of green laws and brilliant teeth. Also, i think it is true that there are too many chemicals in our water. I have repeatedly detected high levels of Oxidane in my tap water but the city council refuses to do anything about it. I did install a special filter to remove the oxidane, plus it also gets rid of flouride and any other chemicals in the water.