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Tdoth Ache. lY$
There are however, two
'• Charcoal is highly spoken of.
strong objections to it : first, it cuts through hard substances
rapidly, and its improper use may destroy the enamel ; and
secondly, it is a very dirty application to the mouth. When
it is used, that which is made from the areca nut, or from
the vine shrub is to be preferred."
Charcoal, when used as a tooth powder should be very
finely pulverized, and made from soft, rather than hard wood :
we think that there are many other substances to be preferred.
Charcoal has been strongly recommended as a dentifrice, for
its antiseptic property : as applied to the teeth, this does not
amount to much. Dr. Torey recommends animal charcoal,
or ivory black, for a tooth powder;.


TOOTH ACHE.
Tooth ache is caused by two diseases, which are denomi-
nated odontitis and periostitis. The former is an inflamma-
tion of the internal membrane or nerve of the teeth, and the
latter is an inflammation of the periosteum or membrane which
lines the sockets of the teeth and holds them in the jaws.
Perhaps there is no pain more acute than that sometimes
experienced from tooth ache, and therefore none more to be
dreaded, as most or many persons can bear witness. The
throbbing acuteness of the pain of odontitis, arises from the
confined situation of the internal membrane ; the cavity of
the teeth not permitting that distention or swelling which ac-
companies inflammation ; hence, the pressure upon the nerve
causes the most acute pain.*

* The following characteristic lines are from the 'Address to tha
Tooth ache,' by Robert Burns :
" My curse upon your venomed stang,
That shoots my tortured gums alang,
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