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1 .20130523-Fluoride_Loosens_Bacterial_Enamel_Grip_r2This is Scientific American's 60-Second Health. I'm Karen Hopkin. Got a minute?
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2 .Fluoride helps fight cavities.
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3 .That's why it's in our drinking water and toothpaste.
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4 .But how this mineral works its dental magic is still somewhat mysterious.
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5 .Now, researchers offer an incisive solution.
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6 .They find that fluoride treatment can loosen bacteria's grip on tooth enamel.
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7 .The study is in the journal Langmuir.
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8 .Scientists used to think that fluoride could harden tooth enamel, helping it retain the minerals that protect teeth from the acid produced by our oral flora.
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9 .But recent work has shown that fluoride doesn't really penetrate past the tooth's thinnest outer layer, suggesting that something other than hardening is going on.
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10 .To drill deeper into this toothsome mystery, researchers whipped up a set of artificial choppers, made of the same stuff as teeth.
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11 .And they used atomic force microscopy to take a closer look at how bacteria interact with this dental material.
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12 .They found that three different strains of cavity-causing bugs cling less tightly to enamel that's been rinsed with fluoride.
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13 .The bacteria carry a net negative charge on their surfaces.
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14 .So the negatively charged fluoride ions in the treated enamel may be literally repulsive to the bacteria.
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15 .Which causes them to bite the dust.
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16 .Thanks for the minute, for Scientific American's 60-Second Health. I'm Karen Hopkin.
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