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The World Health Organization’s drinking water quality Guideline Value for fluoride is 1.5 mg / litre (WHO, 1993).

WHO emphasises that in setting national standards for fluoride it is particularly important to consider climatic conditions, volumes of water intake, and intake of fluoride from other sources (e.g. food and air).

Your comments, suggestions, critique, and ideas:
Linus Pauling

I have something that I call my Golden Rule. It goes something like this: 'Do unto others twenty-five percent better than you expect them to do unto you.' … The twenty-five percent is for error. Apple