When a person eats sugary food, the bacteria present in his mouth act on the sugar producing acids.The acid first dissolves the calcium salts from the top part of the teeth and then from its middle part damaging the teeth. The damages utimately reach the lower part of the tooth which contains nerves and blood vessels ultimately causing toothache.
1. Name the top part of the teeth whose calcium salts are dissolved by acids.
a. Enamel
b. Dentine
c. Pulp cavity
d. None of the above
2. Name the middle part of the teeth.
a. Enamel
b. Dentine
c. Pulp cavity
d. None of the above
3. Name the lower part of the tooth.
a. Enamel
b. Dentine
c. Pulp cavity
d. None of the above
4. Which of the following statements is true about dental carries?
a. Breakdown of teeth due to acids
b. Results in pain and difficulty with eating
c. Caused by the action of acids on the enamel surface
d. All of the above
5. Dental carries is due to
a. Hereditary abnormalities
b. Bacterial infections
c. Viral infection
d. Contaminated water
