. Principles and practice of filling teeth. nly irritate the gum, but they invite the rede-position of fresh calculus so that the relief is only gum need not be expected to become healthy where anyappreciable particles of the deposit are left, and in a week or two 26 PRINCIPLES AND PRACTICE OF FILLING TEETH. after the operation for removal it is frequently possible to locatethe precise points at which flakes of calculus have been overlooked,on account of the appearance of the gums at these places. If apurplish or congested condition of the gum persists at certainpoints, it may be
. Principles and practice of filling teeth. nly irritate the gum, but they invite the rede-position of fresh calculus so that the relief is only gum need not be expected to become healthy where anyappreciable particles of the deposit are left, and in a week or two 26 PRINCIPLES AND PRACTICE OF FILLING TEETH. after the operation for removal it is frequently possible to locatethe precise points at which flakes of calculus have been overlooked,on account of the appearance of the gums at these places. If apurplish or congested condition of the gum persists at certainpoints, it may be taken as an almost infallible indication that a bitof serumal calculus is lying under it. These facts are eloquentobject-lessons as to the necessity for constant vigilance in keepingthe teeth free from deposits. Removal of Stains from the Teeth. After salivary calculus has been removed with instruments, itwill usually be found that the surfaces formerly covered by thedeposit are left somewhat roughened and in need of polishing to Fig. prevent a ready attachment of fresh calculus, while the surfacesextending from the point of deposit are ordinarily more or lessstained and unsightly. To complete the operation as it should be,and also to remove stains from the teeth where there has been nosalivary calculus, it is necessary to so polish the surfaces of theteeth by friction that the enamel will assume a white and glisten-ing appearance. This is best accomplished by rotary appliances in the engine inthe form of brushes, rubber cones, or moose-hide points carryingpulverized pumice. Probably the most effective method in ordi-nary cases is to use the small polishing brushes made for the pur-pose, Fig. 16, though there are occasionally places where the conesor points may reach to better advantage. The brushes shouldinvariably be of the stifPer variety, on account of the tendency tosoften from the moisture after a few revolutions on the tooth. Ifthe brush becomes soft it is useless.
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