Page 35 - My FlipBook

REMOVAL OF TARTAR 19
used. Acids are sometimes necessary, but should
always be used with discretion, and only when
necessary. Sulphuric acid up to 50 per cent, is
generally selected, but a sufficiently strong solution
of aqua regia will often act more promptly. Bicar-
bonate of soda should be applied immediately after-
wards in order to neutralise the effect of the acid
on the enamel, and if the teeth are then well rubbed
with an orange-wood stick charged with soap, they
will feel smoother and more comfortable. Polishing
can be effected with fine pumice-stone, applied on
labial surfaces with the orange-wood stick, and on
lingual surfaces, or wherever the straight stick can-
not be readily applied, wooden or leather wheels
may be used in the dental engine. Circular brushes
are often used, but are apt to cause much spatter-
ing about of the powder. If thought good, finely-
powdered Hindostan stone, and finally, precipitated
chalk may also be used.