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CATECHU. 325
When employed to obtund the sensitiveness of dentine, it is
necessary to confine it in the cavity of the tooth for a few days,
by means of a temporary filling of zinc preparation, as it readily
dissolves Hill's Stopping and gutta percha. When it is used in
the form of an injection in alveolar abscess, a sharp, burning sen-
sation is experienced as soon as it reaches the seat of the affec-
tion, when the crown cavity of the tooth should be immediately
closed.
In patients of a scrofulous diathesis, it is necessary to exercise
care in the use of carvacrol. When applied to cavities before the
introduction of the filling, and to exposed pulps, it is introduced
on a pellet of cotton.
CATECHU -CATECHU.
Source.—Catechu is obtained from the Acacia catechu, a large
tree of Pegu, and is in the form of large, hard, and brittle masses,
porous on fracture, and possessing a strong astringent and sweet-
ish taste.
Medical Properties and Therapeutic Uses.—Catechu is a valuable
astringent, and is frequently employed in diarrhoeas of relaxation,
and locally in gonorrhoea or leucorrhoea in the form of injections.
Dose.—Gr. j to xxx.
Tinctura Catechu Composita.—Compound Tincture of Catechu
(catechu, 12; cinnamon, 8, in diluted alcohol, q. s. ad. lOO
parts).
Dose.—Trixf5j.
Dental Uses.—Catechu is a valuable local astringent in the
form of a mouth wash for spongy gums, and relaxed condition of
the oral mucous membrane.

DENTAL FORMULA.
J^or Hemorrhage after Extraction of Teeth.
Dr. D. a. Rosenthal.
(For Internal Administration.)
R. Tinct. catechu f^j
Tinct. digitalis f^iss
Extr. ergota; fl q. s. ad. f^ij. M.
SiGNA.—A dessertspoonful every 2 hours.