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72 CARIES OF THE TEETH.
tors employ simply the bicarbonate of soda for this
purpose, with the happiest results. As another class
of topical applications to check or modify caries,
those have been suggested, which will form an insol-
uble compound with the gelatinous or animal portion
of the tooth ; such as tannin, creosote and some of the
essential oils. The only effect of these, however, is,
to form a shield or protection over the structure be-
neath : there is, of course, no change effected in the
conditions or agencies which produce the decay.
