On their complete and entire state also depends the perfection of
utterance and articulation. The child, for instance, makes no attempt
at articulation until it has acquired several teeth; this faculty
becomes also exceedingly imperfect during the process of changing them;
from this time it continues to improve, until again it is permanently
impaired in old age, when they are finally lost. And so again, if a
child lose merely a single tooth from the front of its mouth, lisping
will result; or if a supernumerary or irregular tooth be present, the
articulation will be abrupt and imperfect:--the former plainly showing
the importance of the entireness of the series, and the latter, the
necessity of regularity in their arrangement and position.
The teeth, however, are chiefly important in relation to the part they
sustain in connection with digestion, viz. the mastication of the food.
By this act the food, after being received into the mouth, is mixed
with the saliva and broken down, till it becomes of an uniform pulpy
consistence, fit for being easily swallowed, and acted upon by the
gastric juice on its arrival in the stomach. That due mastication of
the food is essential to healthy digestion, which will be promoted or
retarded in exact proportion as it approaches or falls short of this
point, is a fact so generally known as scarcely to need comment.
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