Science Fair Project Encyclopedia
Extra is a type of chewing gum from Wrigley's that is sugar-free, yet still has a distinct, long-lasting flavor. It was introduced as the first such gum in the USA in 1984, and is produced in Peppermint, Spearmint, Classic Bubble, Cinnamon, Winterfresh, Polar Ice, Wildberry Frost and Cool Green Apple flavours.
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