Chewing gum used to be made from thickened resin and latex from certain kinds of trees, or from various kinds of sweet grasses, leaves, grains and waxes. In ancient Greece mastic gum was chewed, which was obtained from the mastic tree. Now, big chewing gum manufacturers make chewing gum synthetically from styrene-butadiene rubber, known as Buna S, which is made from a reaction of styrene and butadiene.
A surprising and funny fact: rubber tyres and chewing gum are both made of styrene-butadiene rubber or polymers.
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