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?
- What are (i) part C, and (ii) part D, of tooth known as?
- By what name are the holes E in the tooth known?
- Name the part F of the tooth.
- What will happen if organisms A reach part F of the tooth known?
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- Organism A is bacteria.
- Substance B is acid.
- Part C is the tooth enamel.
- part D is the dentine of the tooth.
- The small holes, E, are known as cavities.
- F is the pulp of the tooth.
- When a bacterium (organism A) reaches the pulp (part F) of the tooth, it irritates the nerve endings and causes toothache.
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