what you bought must be fake. Yida is a chewing gum brand owned by Wrigley Company in the United States. Wrigley instructed Yida to be used as a trademark, and Yida was never registered as the company name. And the Jetta gum you bought from the so-called "American Yida" company is obviously a brand-name behavior. As long as it is called "so-and-so Yida Company" in the market, it must be fake.