Researchers believe fluoride helps prevent cavities because
fluoride helps keep the bacteria from sticking to teeth. They pointed out studying teeth is difficult
because teeth vary among people. They
used artificial teeth made from hydroxyapatite (one of the main ingredients of
tooth enamel). They polished the
artificial teeth to a fine finish, and then exposed some to fluoride before
applying bacteria. The fluoride-coated teeth had decreased bacteria sticking to
them. This study can be found at http://pubs.acs.org/doi/abs/10.1021/la4008558?prevSearch=fluoride&searchHistoryKey=
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