CAIE IGCSE Biology 7.3.4 Structure of human teeth

Practise labelling tooth sections and explaining how bacteria, sugar and acid damage enamel and dentine during tooth decay.

Exam points

label enamel, dentine, pulp, nerves, blood vessels or gum in tooth sections
explain tooth decay by linking sugar residues, bacterial respiration and acid erosion
distinguish enamel and dentine as tooth layers damaged when acid dissolves hard tissue

[Maximum number: 8]

(a)

Fig. 2.1 is a vertical section of a human molar tooth and surrounding structures.

Fig. 2.1

State the names of the parts labelled A to D on Fig. 2.1.

A

B
C

D

[ 4 ]

(b)

Fig. 2.2 is an X-ray of decay in a molar tooth.

Fig. 2.2

Explain how tooth decay occurs.

[ 4 ]

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