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How early could we reasonably invent mouthwash?

Listerine's active ingredients are all natural: menthol (peppermint, mint), thymol (thyme), methyl salicylate (wintergreens), eucalyptol (eucalyptus, basil, rosemary, and several other spices), and ethanol. All of the ingredients can be found pretty much across the planet.

Of course, you need to have a society that's interested in oral hygiene, but thats not too unreasonable. Sure, most humans throughout history didn't think too much about bad breath, but mouthwash does help keep teeth healthy, as well, and people have long cared about at least good looking teeth.
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