(a) (i) Organisms A ---Bacteria
(ii) Bacteria (A), present in the mouth act on sugar and produce acid (B).
(b) (i) The topmost part of the tooth is enamel (C). It is the hardest tissue in the body.
(ii) The middle part of the tooth is known as dentine (D).
(c) Dental caries (E) is tooth decay.
(d) The lower part of the tooth is known as pulp cavity (F) which contains nerves and blood vessels.
(e) If bacteria (A) reach the pulp cavity (F) of the tooth it would cause inflammation and infection which would then lead to severe pain.
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When a persLakhmir Singh & Manjit Kaur- Biology