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 part C of the tooth and them from its middle part D froming holes E. These holes ulitimately reach the part F in the lower part of tooth which contains nerves and blood vessels. The substance B irritates the nerves ending 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 ?

Answer

(a) (i) Bacteria (ii) Acid (b) (i) Enamel (ii) Dentine (c) Dental caries (d) Pulp cavity (e) Inflammation and infection will occur leading to severe pain