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Some mouthwash has been implicated in oral cancers.

Listerine has offered an alcohol-free (alcohol being the concern for oral cancer) version for quite a while.

Presumably they still pay out on that, but I wonder if with sufficient shift in formulation and brand, they could get out of it?

AFAIK, they must pay for volumes of all products sold under the Listerine brand name, regardless of formulation.