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24 INTRODUCTION.

posits of this substance on proximal surfaces of the
teeth are to be carefully observed, and removed with
instruments of attenuated blades. When the thick
incrustations have been thus removed, the surface
should then be gently scraped, so as entirely to clean
off all remaining portions, and afterward thoroughly

polished with fine pumice, or Arkansas or rotten-stone,
and finished by burnishing. During the operation, a
frequent employment of the toothbrush with water
will be required, to cleanse the mouth of the detached
deposits and the increased secretions; and, in general,
the completion of the process will occupy more than
one sitting. Since this deposit often extends beneath
the free margin of the gum, much care is necessary
to see that it all be removed.

GREEN TARTAR.

This deposit has been so referred to by writers, as
to convey the impression that it is of the same
generic character as salivary calculus. Such a mis-
apprehension is hardly pardonable. The teeth of
young persons only are subject to this affection, it
being often found on those of children three or four
years old ; appears on the labial surfaces of the su-
perior front teeth, and in largest quantity near the
margin of the gum. It is seldom seen on the inferior