Why don't some cities add fluoride to the drinking water?

Answer 1

Fluoride is a naturally occurring mineral that's found in the Earth's crust. In the body, it occurs as calcium fluoride. Since the 1930s, health professionals have conducted studies showing that small amounts of fluoride in public drinking water (around one part per million) have reduced tooth decay in children by as much as 50%, although fluoride's effectiveness and safety have recently been called into question.
Excessive amounts of fluoride in drinking water (over 4 parts per million) can have harmful effects. Colgate suggests that parents should monitor young children's toothbrushing habits (since kids are more likely to swallow toothpaste), and keep any fluoride-supplement tablets in a safe place.

As a result of fluoride's toxicity in high doses and alleged links to increased rates of certain diseases, it has naturally become a somewhat controversial topic with regards to public drinking water.

Answer 2

Chinese water isn't really potable (reliable drinking water). They must boil the water to make sure it doesn't have any bacteria in it. I drank from the tap a few times, and never had any problems... but it isn't a risk worth taking TOO often.

That's why they drink hot drinks like tea. (The only cold drinks are bottled beers, foreign sodas and purified water.) Most schools and employers (outside of office buildings) provide huge tanks of very hot water so that employees can bring rice and tea to prepare during lunch breaks.

Answer 3

good qn

Answer 4

so your teeth don't decay