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Via Wikipedia
Birch Bark Tar Gum
It turns out that ‘gum’ existed over 5,000 years ago. However, it wasn’t chewed to freshen breath, or to blow bubbles, it was chewed in an attempt to treat and prevent mouth infections. The gum fossil was discovered by a 23-year-old British archaeology student while she was on a dig in Finland. The gum was found to have teeth marks in it that belonged to a person of the Neolithic age.
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