Dentin 牙本质

Dentinis the yellowish layer found underneath the enamel of every tooth.
It is softer than enamel but still strong, and it gives the tooth most of its shape.
Inside thedentinare tiny tubes that lead to the center of the tooth, where nerves live.
If the enamel is worn away, hot or cold food can reach thedentinand make your tooth feel sensitive.
Dentinhelps protect the soft parts inside your teeth from damage.
Becausedentincannot be seen without special tools, most people do not notice it until there is a problem.

牙本质是每颗牙齿釉质下面的一层淡黄色组织。
它比牙釉质软一点，但仍然很坚固，并且为牙齿提供基本形状。
牙本质里面有很多小管道，连着牙齿中间的神经。
如果牙釉质损坏，冷热食物就能碰到牙本质，让牙齿变得敏感。
牙本质能保护牙齿内部的软组织不受伤害。
平常用肉眼看不到牙本质，只有出了问题或用专业工具才能发现。

配套练习?? dentin /?den.t?n/

?? 完形填空（Cloze Test）

Dentinlies just ______ the enamel in a tooth.
（a. outside b. under c. above）

Dentinis softer than enamel, but it still helps give the tooth its ______.
（a. color b. shape c. taste）

Tiny ______ in the dentin lead to the middle of the tooth.
（a. tubes b. roots c. spots）

If ______ is gone, hot food can touch the dentin.
（a. enamel b. gum c. hair）

When dentin is touched, the tooth may feel ______ to cold or hot things.
（a. safe b. sensitive c. quiet）

? 选择题（Multiple Choice）

Which layer is found below the enamel?
A) Dentin
B) Gum
C) Bone

What does dentin protect?
A) The nerves inside the tooth
B) The lips
C) The tongue

How can people know about their dentin?
A) By looking in the mirror
B) If they feel pain with hot or cold food
C) When their teeth are very white

?? 填空题（Fill in the Blanks）

The yellow part under enamel is called ______.
（可选答案：dentin, vein, muscle）

If enamel is lost, food can reach the ______ more easily.
（可选答案：dentin, tongue, saliva）

Special ______ are needed to see dentin.
（可选答案：tools, pillows, leaves）

Dentin has tiny tubes that lead to the ______ in the center.
（可选答案：nerves, gums, eyes）#p#分页标题#e#

练习答案?

完形填空

b. under b. shape a. tubes a. enamel b. sensitive

选择题
6. A) Dentin
7. A) The nerves inside the tooth
8. B) If they feel pain with hot or cold food

填空题
9. dentin
10. dentin
11. tools
12. nerves

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