Placeholder Image

字幕列表 影片播放

  • 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 http://www.SmartLearningforAll.com

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

Smart Learning for All

字幕與單字

影片操作 你可以在這邊進行「影片」的調整,以及「字幕」的顯示

B2 中高級 美國腔

蛀牙是什麼原因造成的?| 蛀牙的原因是什麼? (What causes cavities? | #aumsum)

  • 31 5
    AumSum 發佈於 2021 年 01 月 14 日
影片單字