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23 becaufe it would remove and deftroy that folid bafe, indifpenfably neceffary for the firm fecurity, and maf- ticating ufe of an artificial tooth, which may be fet to very great advantage, where there is a folid flump ftanding. Having already explained the deftruclive confe- quences refulting from differing the food, Sec. to collect and remain upon the teeth, I fhall conclude by a humble and refpectful requeft, that parents, guardians, governeffes and nurfes, will attentively watch the growth of their children's or wards' teeth : whenever an irregularity appears, to call immediately for profeffional affiftance, and to habituate them to the healthy, cleanly practice of thoroughly brufhing their teeth, infide and out, every morning with a toothbrufh and pure water; and twice or thrice a week with an innocent dentifrice or tooth powder; a practice indifpenfably neceffary by every human being whowifhes to preferve the teeth as nature form ed them, white, found and beautiful. The public are refpectfully informed that the fol lowing certificates givenby the hon. Samuel L. Mitchell M. D. F. R. S. E. Profeffor of Chemiftry, Natural Hiftory and Agriculture, in Columbia College, Re- prefentative in Congrefs, for the city of New- York, one of the phyficians of the general hofpital, Sec. and Dr. David Hofack, Profeffor of Botany and Materia Medica in the Columbia College; and Dr. James Tillary, refident Phyfician of the city of New-York, the innocency and of his abundantly prove efficacy dentifrice or tooth powder, and anti-fcorbutic tinclure for the teeth and gums. (CERTIFICATES.) Eafl Rutgers Street, New-York, May 15, 1801. Mr. Richard C. Skinner, Surgeon Dentift in New- York, has difclofed to me his receipt for a powder