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They chewed it to keep their breaths fresh, filling cavities, cleaning their teeth, and sticking objects together in everyday use, whereas the ancient Greeks chewed mastic gum, made from the resin of the mastic tree.
Mastic gum, like birch bark tar, has antiseptic properties, and is believed to have been used to maintain oral health.
Ancient Greek women chewed mastic to clean their teeth and freshen their breath; Native
Mohammed heats the lapis lazuli powder with beeswax, pine resin, mastic gum, and linseed oil.
See, like this one, mastic.