> Listerine is the only branded OTC antiseptic mouthwash in the United States approved by the American Dental Association.

The full list of ADA-approved products for plaque/gingivitis control is here:

https://www.ada.org/resources/research/science-and-research-...

All of the rinses in that category have formulas similar to Listerine, but many of them are generic store brands that have also independently obtained ADA approval. The generic rinses work just as well as Listerine, and they wouldn't be subject to the royalties.