Wrote Letter L-407 of 1702-12-08 to John Chamberlayne about cleaning and preserving teeth by polishing them with salt and ash of tobacco and whether tea and coffee harm teeth; requested a book on Peruvian silver mines

December 8, 1702
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Text of the letter in the original Dutch and in English translation from Alle de Brieven. The Collected Letters at the DBNL - De Digitale Bibliotheek voor de Nederlandse Letteren

Leeuwenhoek wrote this letter about dental hygiene: Leeuwenhoek recommended polishing teeth with salt and ash of tobacco. He does not believe that drinking tea and coffee is bad for the teeth. He also asks for a book on silver mines in Peru to be sent to him.