Actually, it's really hard to imagine that chewing gum is one of the oldest types of candy in the world. Archaeologists have even shown that prehistoric men and women on tree resin because the taste had to chew it. That was more than a thousand years. It was also noted that almost all cultures chewed on some form of chewing gum. The ancient Greeks called tree resin "mastic" and chewed it to clean their teeth and freshen the breath.