Mint is naturally anti bacterial, original toothpastes were usually made with natural oils, mint, cinnamon etc. people used to chew mint leaves to freshen their breath, I think it stuck. I also agree with the comments about flavor without sugar additives, although most toothpastes are sweetened with xylitol now because it is an anti cavity as strep mutan bacteria can not ingest it and produce the acid that causes cavities. 🤷🏼♀️
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