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334 EXTRACTION OF TEETH.

rary teeth, may indicate the removal of one or more
of the latter. It is important to understand the true
indications for the removal of temporary teeth ; in

these, as in the permanent teeth, apparent indications
are liable to be mistaken for real ones. Teeth may
sometimes, even though undecayed, produce nervous
affections, and in such a manner as to render their
removal necessary. This indication is most frequent
with teeth affected by exostosis.
A high state of inflammation in the contiguous
parts, is regarded by some as a counter indication
but it can be such only in cases in which the inflam-

mation would be increased by the operation ; and this
would happen only where there is a decided inflam-
matory diathesis; which peculiarity can be readily
detected by careful observation.

EXTRACTING INSTRUMENTS.

Numerous and various instruments have been em-
ployed for extracting teeth ; and each of these has
passed through various modifications. Imperfection
and inadaptation have, till within a few years, char-
acterized them all in a marked degree, as indicated
by the numerous changes they have undergone. Two
general classes comprehend them all—represented by
the key and the forceps. The former makes its