The Dental cosmos . Action of friction in conjunction with lactic acid 1 per cent, on filled tooth.(Compare with Fig. 31.) Fig. Action of oxalic acid 1 : 1000 in conjunction with friction on tooth with gold filling. 234 THE DENTAL COSMOS. nish a valuable indication as to the causeof the process. This fact is illustratedby the case of a woman in the forties, Fig. 36.

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