Aesop will handle TV, social media, direct marketing and digital activity for Tic Tac.
The agency previously worked with the brand on a project basis and created the "five a fiver" campaign in September 2014. It also helped to promote a new Tic Tac flavour, apple burst, in June that year.
Roger Hart, the chief executive of Aesop, said: "It’s a great business and a brilliant brand, and we relish the opportunity to continue creating and sharing the Tic Tac story."
The Corner won the Tic Tac ad account in July 2013 after fighting off competition from BETC London but stopped working with the brand about a year ago.
A spokesman for Ferrero said: "Their creative flair, thorough understanding of the brand and smart narrative approach – demonstrated by two highly effective projects – made Aesop the obvious choice."