What is the hard substance that covers the tooth known as?

Gum

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Dentine

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Bone

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Enamel

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Solution

The correct option is D Enamel
Human teeth are of four types, namely incisors, canines, pre-molars and molars. Each of these tooth is covered by a hard substance called enamel. Enamel is made up of calcium salts. It is known to be the hardest tissue in the human body.

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Q. When a person eats sugary food, then organisms A present in his mouth act on sugar to produce a substance B. The substance B first dissolves the calcium salts from the top part C of the tooth and then from its middle part D forming holes E. These holes ultimately reach the part F in the lower part of tooth which contains nerves and blood vessels. The substance B irritates the nerve endings inside the tooth causing toothache.
(a) What are (i) organisms A, and (ii) substance B?
(b) What are (i) part C, and (ii) part D, of tooth known as?
(c) By what name are the holes E in the tooth known?
(d) Name the part F of the tooth.
(e) What will happen if organisms A reach part F of the tooth known?

When a person eats sugary food, then organisms A present in his mouth act on sugar to produce a substance B. The substance B first dissolves the calcium salts from the top part C of the tooth and then (rum its middle part D forming holes E. These holes ultimately reach the part F in the lower part of tooth which contains: nerves and blood vessels. The substance B irritates the nerve endings inside the tooth causing toothache.

(a) What are (i) organisms A, and (ii) substance B?
(b) What are (i) part C, and (ii) part D, of tooth known as?
(c) By what name are the holes E in the tooth known?
(d) Name the part F of the tooth.
(e) What will happen if organisms A reach part F of the tooth?

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What is the hard substance that covers the tooth known as?

The correct option is D EnamelHuman teeth are of four types, namely incisors, canines, pre-molars and molars. Each of these tooth is covered by a hard substance called enamel. Enamel is made up of calcium salts. It is known to be the hardest tissue in the human body.

The correct option is D Enamel
Human teeth are of four types, namely incisors, canines, pre-molars and molars. Each of these tooth is covered by a hard substance called enamel. Enamel is made up of calcium salts. It is known to be the hardest tissue in the human body.