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Question
The question has four options. Choose the correct answer:
The hardest constituent of the tooth is
Options
bone
dentine
enamel
pulp
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Solution
Enamel
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| 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. |
- What are (i) organisms A, and (ii) substance B?
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- Name the part F of the tooth.
- What will happen if organisms A reach part F of the tooth known?
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