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Smart Learning for All
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Topic: Tooth decay.
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What causes cavities?
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A black sketch pen.
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No.
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Our mouth contains billions of bacteria which live on our teeth, tongue, etc.
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Most of these bacteria are usually harmless.
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Just like me, right?
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Now listen.
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A tooth consists of enamel, dentin and pulp.
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Enamel is mostly made up of minerals.
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Dentin is a layer underlying the enamel.
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Whereas, pulp has blood vessels and nerves.
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Now, when we eat foods containing sugars, some of these bacteria feed on the sugars producing acid.
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This acid starts to dissolve the minerals of the tooth enamel, causing tooth decay.
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Usually, our saliva restores these minerals, thus preventing further decay.
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But if we continuously eat sugary foods, then our saliva cannot keep up.
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Causing the bacteria to pass into the dentin and then eventually into the pulp, thus creating cavities.
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