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GENERAL PRINCIPLES—DECIDUOUS TEETH. 601
the principles involved are nearly the same as for the permanent. A
care, however, must be taken that is not necessary Avith the perma-
nent teeth, i. e. to avoid injuring the developing permanent teeth that
are situated immediately beneath them.
Fig. 541, Avhich shows all the deciduous and the developing perma-
nent teeth except the third molars, gives a true idea of their relative
positions. Special attention is drawn to the position of the crowns of
the bicuspids as related to the deciduous molars. It will be seen that
they are situated between the roots of the latter teeth, and by using
undue force in adjusting the forceps these crowns could easily be mis-
placed, extracted, or injured.
If the deciduous teeth are extracted at the proper time they can
usually be removed by tlu' thumb and finger as described. If not,
one of the forceps shown in Figs. 488 and 489 should be used.

Fig. 541.

Dentures of a child six years uf age.

Extraction of Individual Permanent Teeth.
The anatomy of the individual teeth and the majority of their
often-repeated variations as well as the general principles govern-