Which is the world’s most expensive chewing gum? Well, MASTIKA GUM GOLD was the most expensive. The package costs $ 280. The package contains four boxes and each box contains 24 chewing gums. Twenty-four times four is 96. If we divide the price by 96, we see that each chewing gum costs almost $ 3. What justifies the high price? MASTIKA’s argument is that the chewing gum is sweetened with Xylitol and decorated with gold flakes. Xylitol is better than Aspartame, but it is a relatively common sweetener in chewing gum. Gold is not as common, but it is neither good nor bad. Gold does not excrete anything on its way through the body.