I recommend Perio oral spray!

I recommend the Perio 46cm Long Lasting Cool Mint Spray! First of all, it's small, so it's great to carry around in a pouch. True to its name, the scent lasts quite a while, and since it has a pretty strong mint fragrance, I love that the freshness lasts for a long time!

It looks like a tiny amount, but maybe because I don't use it every day, it actually lasts longer than I expected! Olive Young also has frequent sales, so I always tend to repurchase it before I run out :)