Pfizer Inc., the maker of Listerine mouthwash, is suing Procter & Gamble Co. for falsely claiming in television ads that four out five dentists would recommend its rival brand Crest Pro-Health mouthwash. “P&G’s false and misleading claims concerning Crest Pro-Health cause a substantial number of consumers to believe that this product is recommended by the vast majority of dentists – which is false – and that these dentists are recommending it for specifi...