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Fig. 121.

Fig. 121. A photomicrograph ot .in extensive decay o( the enamel on tlie proximal surface of a
molar. d. Dentin. E. Enamel. x. Area of deca.y of enamel. Y. An extension of the super-
ficial beginning of caries gingivall.v furtlier than the illustration shows. No enamel rods have fallen
out. The enamel is decayed through to the dento-enamel junction and some solution of the dentin has
been begim by the percolation of acid through the decayed enamel. The extension of caries of enamel
gingivally is characteristic of lodgments of food between the teeth and absorption of the inter-
proximal gum tissue.