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  • Smart Learning for All

  • Topic: Tooth decay.

  • What causes cavities?

  • A black sketch pen.

  • No.

  • Our mouth contains billions of bacteria which live on our teeth, tongue, etc.

  • Most of these bacteria are usually harmless.

  • Just like me, right?

  • Now listen.

  • A tooth consists of enamel, dentin and pulp.

  • Enamel is mostly made up of minerals.

  • Dentin is a layer underlying the enamel.

  • Whereas, pulp has blood vessels and nerves.

  • Now, when we eat foods containing sugars, some of these bacteria feed on the sugars producing acid.

  • This acid starts to dissolve the minerals of the tooth enamel, causing tooth decay.

  • Usually, our saliva restores these minerals, thus preventing further decay.

  • But if we continuously eat sugary foods, then our saliva cannot keep up.

  • Causing the bacteria to pass into the dentin and then eventually into the pulp, thus creating cavities.

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Smart Learning for All


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B2 中高級 美國腔

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    AumSum 發佈於 2021 年 01 月 14 日