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Lardner's Tooth Powder

Take of powdered charcoal (recent), 1 ounce; prepared chalk (see No. 1292), 3 ounces; mix, and keep it from the air. A simple, but good tooth powder, known also as Lardner's Prepared Charcoal. les Dents; &c. These preparations should be compounded of materials which, while cleaning the teeth without injury to the enamel, will also be anti-acid, anti-scorbutic, and tonic in their action upon the gums.

Cooley says: "Great care should be taken to finely pulverize all the dry ingredients, and to reduce the harder and gritty ones to the state of impalpable powder, either by patient levi- nic acid), 3 drachms; red lake, 1 drachm; gation or trituration, or by elutriation. (See oil of mint and oil of aniseed, of each 7 or 8