Placeholder Image

Subtitles section Play video

  • 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.

  • For more educational videos please visit

  • Also, don't forget to subscribe to our YouTube channel.

Smart Learning for All

Subtitles and vocabulary

Operation of videos Adjust the video here to display the subtitles

B2 US enamel tooth pulp bacteria decay saliva

What causes cavities? | #aumsum

  • 30 4
    AumSum posted on 2019/04/15
Video vocabulary