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Student Finds 5000-Year-Old Chewing Gum
itsthebin writes "Sarah Pickin, 23, found the lump of birch bark tar — complete with neolithic tooth prints — on a dig in Finland. Ms Pickin's tutor at the University of Derby, Professor Trevor Brown, said birch bark tar contained phenols, which are antiseptic compounds. 'It is generally believed that neolithic people found that by chewing this stuff if they had gum infections it helped to treat the condition. It's particularly significant because well-defined tooth imprints were found on the gum which Sarah discovered,' he said. Ms Pickin was on a volunteer program at the Kierikki Centre on the west coast of Finland when she made the find."
Just to be pedantic...
Xylitol is actually a sugar alcohol, not a "true" sugar. Sorbitol is similar. Both are good for you because the bacteria in your teeth try to digest it, but can't actually get any nutrition from it -- so the energy spent trying is wasted.
Dental Carries didn't become common until man started farming cereal grains. As you guessed, cavities became even more common with the introduction of cheap sugar. You may enjoy this article about primitive diets. http://www.westonaprice.org/traditional_diets/nast y_brutish_short.html
It's 7000 years old.