they certainly do a lot of eating in the book, it only follows by logic that they would do a lot of #2 and #1 as well. but it would also be funny if he included it. i suppose eating has a joyous celebratory (or at least positive) connotation to it.
besides, there's always algae which has dental hygienic properties. surely there might also have been some elven weed with such effects?
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