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50 THE TIGHTENING OF LOOSE TEETH

To give teeth a natural and lifelike appearance, a
slight covering with Italian brown will be sufficient.
If the artificial tooth be too long and unnatural,
level the natural teeth, and grind a small groove, the
Italian brown that is deposited there during the firing
giving the tooth a shortened and interrupted
appearance.
In case there are fissures in the enamel of natural
teeth, a slight perpendicular stroke should be drawn
over the artificial tooth with the edge of a needle-file,
and the application of Italian brown colour will imitate
the fissure on the artificial tooth.
In the case of smokers, the neck of the teeth must be
coloured a little more deeply ; the same may be done
wherever dark deposits occur at the gingival margin.
Darker deposits may be obtained by mixing green and
brown ; chalky spots in the enamel by little dots of
white colour.
Erosions should be ground in with a sharp
wheel.
Cutting edges, when worn down, may be imitated by
drawing little brown-coloured rings on the artificial
tooth.
If in artificial teeth denudation of the root, due to
gingival atrophy, is to be imitated, Jenkins' brown-
coloured prosthetic can be fused on.
The colour is mixed with water, laid on more or
less thickly, and fired in the furnace until the tooth
becomes red-hot.
Whoever has seen artificial teeth adapted in this