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Fio. 131.

Fig. 132.

Fig. 131. A beginmng decay in the distal surface of a lateral incisor from which the enamel
rods are falling away and progress of decay has begun in the dentin. A delicate hyaline area stretches
away toward the pulp chamber.
Fig. 132. A decay in a worn cuspid that has made greater progress. This picture is liable to
^ve a false impression for the reason that the cut is a little to the side of the central area and shows
the enamel penetrated with the enamel rods still in position, when, in fact, the cavity was open
through the enamel.
15b