The win includes brands such as Certs, Clorets, Dentyne and Stimorol, which the British food company acquired when it bought chewing gum firm Adams Confectionery in a $4.2bn (拢2.7bn) deal in December.
Adams was the world's second-biggest chewing gum business after Spearmint gum and Xtra owner the Wrigley Company.
Cadbury bought the company from pharmaceutical giant Pfizer, beating off rivals including Nestle and Kraft Foods, which were both interested in Adams.
The market for chewing gum is growing faster than chocolate around the world. At the time of the purchase, John Sunderland, CEO of Cadbury Schweppes, said that Adams brought powerful brands and access to new markets to the firm.
While part of the Pfizer empire, the brands had been handled by Bates Worldwide, run from its New York office.
The move will be another blow for WPP Group, which last month bought Bates parent Cordiant Communications.
Cadbury Schweppes said it did not want to see the chewing gum and mints business reassigned to J Walter Thompson, like a lot of Bates' business has been.
JWT already handles a number of pieces of Cadbury Schweppes business including Bubbaloo, Bubblicious, Halls and Trident. Earlier this year, the agency worked on the first gum under the Halls brand -- Halls Shotgum, a mainstream menthol-flavoured gum aimed at 15- to 21-year-olds.
Earlier this year, Cadbury Schweppes began a review of its $250m global media planning and buying account, which is still under way.
Pitches have already taken place for the US account and the confectionery giant is now reviewing its assignments in Europe and Asia.
The European account is split between OMD, Mediaedge:cia and Carat. Carat and its sister Aegis agency, Vizeum, are the incumbents on the 拢21m UK account.
Cadbury is one of the biggest confectionery firms in the world, employing 55,000 people and has a market capitalisation of 拢7.2bn.
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