When Kayla Hess, then 10 years old, used Listerine Agent Cool Blue mouthwash in 2007, she became ill with repeated strep throat infections and stomach cramps. She even cracked a permanent molar tooth.

Recalled in April 2007 by McNeil-PPC Inc. a subsidiary of Johnson & Johnson, the Listerine mouthwash contained four kinds of bacteria, said Brian Smith, a West Palm Beach attorney representing Kayla and her mother Susan McKenzie, in a federal lawsuit filed in U.S. District Court in West Palm Beach.

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