ELI5 Mint - why it became associated with freshness?

ELI5 Explain Like I'm 5: Bite sized answers to stuff you should know about - in a mini podcast

How is spearmint and peppermint different? How did mint become associated with freshness and cleanliness in products like toothpaste and gum? Why does mint create that feeling in our mouths? Why do mint and citrus flavors clash?

... we explain like I'm five

Thank you to the r/explainlikeimfive community and in particular the following users whose questions and comments formed the basis of this discussion: much_blank, thectcamp, redcat_51, jellyel88 pinkie3141, kakapo117, ilmt206 and socks405

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