Page 648 - My FlipBook

658 DENTAL EMBRYOLOGY AND HISTOLOGY.

observed, is normally so, and may be said to bear a close relationsliip to
the density of the teeth, those hardest being most deeply pigmented, and
vice versa. This ride holds good in human teeth as well, I am inclined
to the opinion that chemical constituents of the enamel have much to do
with its color. The darker teeth are much more resistive to caries than
are the softer varieties.
In the accompanying figure we have combined in one section all the
])roducts of calcification we have been considering—viz. bone of ja^v,
cementum, dentine, and enamel.