The WPP agency won the business after a pitch against fellow Wrigley's roster agencies OMD and MediaCom.
Reports suggested that the review had been sparked by Wrigley's acquisition of Kraft Foods brands Life Savers, Creme Savers and Altoids.
Last year, OMD's sister creative network, BBDO, won the creative assignment for the Life Savers and Creme Savers business, previously with Interpublic's Foote Cone & Belding.
MediaCom handles Wrigley's £14m UK media planning and buying account.
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