Extra

Ranking: 10
Annual sales: $198.2 million
Who makes it: Mars

Extra, which was introduced by Wrigley in 1984, was once the world's No. 1 sugar-free gum, thanks to high-intensity sweeteners that prolonged its flavor. Its sales have plunged 25% in the past year, though, as new brands have come out. A sub-brand, Fruit Sensations, was added last year.

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