Kraft reformed Oreo cookies to make them more successful in China. They made the cookies less sweet to suit Chinese tastes, sold them in smaller, cheaper packages, and marketed them with a "dunking" theme. This involved training student brand ambassadors to educate consumers about dipping cookies in milk. Kraft also introduced a Chinese-style Oreo wafer stick that surpassed regular Oreos in sales. These reforms helped Oreo become the best-selling biscuit in China.