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18 INTRODUCTION.

suggest surgical remedies, and which are implicated
more or less in the operations described in the follow-
ing pages ; and first, of

DEPOSITS.

In this term are included those calcareous forma-
tions commonly called tartar, a certain coloring mat-
ter denominated green or brown stain, and such other
impurities on the teeth as result from neglect, the use
of tobacco, and like causes. The word

TARTAR

Implies all calcareous desposits upon the teeth. Of
this substance there are several varieties, the more
obvious of which have respect to color, composition
and consistence. In color, there are all shades, from
a white as light as that of the tooth, or even lighter,
to a jet black ; and in consistence, all degrees, from a
thick, gummy mucus, to nearly the density of the den-
tine itself. The color will, in most cases, be indicative of
the density, the lightest shade corresponding with the
softest, and the darkest with the hardest consistence.
The tenacity to the teeth is also in proportion to the
density, the dense and dark adhering most firmly.

The density of the desposit, too, is generally indicative