Iowa state bystander. [volume] (Des Moines, Iowa) 1894-1916, 1914-11-13
(Copysisht. 1914 By A. s. Cny)


(copysishe. 1914 By A. s. Gay)
SIGNIFICANCE OF pEcAyEp
TEETH.
A tooth 10 = calcified papilla Of the
mucous membrane. The first evi.
dence Of the development of the teeth
Is to be found in . thickening Of the
mouth epithelium mucous mem,
brane) at the site of the future gum
and q resulting downward growth Of
It's deeper portion into the substance
of the primitive Jaw. This epithelial
downward growth IL continued along
the whole length Of the gum and 10
known a. the dental lamina or tooth
band. The thickening Of the epithe-
lium, which Is the first sign Of the
future teeth, begins about the sixth
week Of foetal life, and the entire den.
tai lamina. or tooth band, is completed
by the end Of tho seventh week.
The development Of all the tempo.
rary end. with the exception of the
eight back molars, also all of the
permanent teeth, commences at an
early period in intrauterine life.
We have thirty-two permanent teeth
and the first Of these to erupt are the
four first molars, which appear during
or soon after the sixth year. These
first permanent teeth come out behind
the second milk molars without dis
placing any Of the temporary teeth.
During the seventh year the central
milk incisors fall out and their place
is taken by permanent ones. These
shed teeth are mere shells Of the
crown of the teeth, all the roots hav-
ing been absorbed. The lateral In
cisors succeed their milk predecessors
in about the eighth year; the first pre-
molars succeed the first milk molars
at about nine years: the second pre-
molars will succeed the second milk
molars at about the tenth year; the
CANNES follow in the eleventh and the
second permanent molars come In be-
hind the FIRST at about the twelfth
year, and finally the third molars. or
what are generally known as the wis.
dom teeth. the foundations Of which
We have noted were laid in about the
nth year of life, erupt somewhere be-
tween the eighteenth and twentieth
Tooth enamel is formed chiefly of
calcium phosphate. with small
amounts Of calcium carbonate. mag
nesium phosphate and calcium fluor.
ide. The dentine is Of the same COM
position % the enamel, but contains
In addition . good deal Of organic mat.
ter. Worldwide Investigations prove
that there 10 q material difference in
the average quality Of the teeth Of
primitive and civilized peoples. Unit.
ed States senate document No. 419
states, for example, that "statistically
the teeth Of Americans are ten times
az bad al those Of the Igorrotes, while
the civilized F1lipinos have teeth as
bad as those Of the Americans" and
for the purpose of pointing out how
bad American teeth really are we
should repeat a quotation from United
States bureau of education bulletin
No. "a that says: "Of our 100000
children enrolled, over 100000 go
per cent, and in some schools as high
as SO per cent? have defective teeth,
which are potentially, If not actually.
detrimental to health"
It is definitely proved that the belief
that certain foods nourish specific
parts or organs Of the body and that
by the use of these foods 1t is posi-
BILE to stimulate the growth or func.
tioning of certain organs is false.
There is no such thing as brain
food, or q muscle food, or a bone food.
Fish, for instance, is commonly re-
puted to be a brain food; but it is no
more a brain food than is beef, or
beans, or cabbage, and when fish Is
eaten the toe nails and the finger
nails, the hair and all other parts and
tissues of the body share in the result
ing nutritive matter in common witt
the brain, each part according to Its
particular needs. Plants and animals
in general are made up out of various
groupings Of some sixteen or more ele-
ments, and so long as we eat these
plants and animals in reasonable guam
tity and in their natural combinations
W. thrive. Our" digestive organs are
adapted to and therefore have the
power to select from these molecular
arrangements such elements as are
required and in the amounts necessary
to construct and maintain our oodies
In normal health and to transform the
energy associated Herewith to our
physical needs. But when in the
course of the preparation Of foodstu9s
constituent elements are for some req
son removed, or when for any reason
It becomes Impossible to secure SUI
ficient supply Of food material and our
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