You can never go wrong with giving them a mint or a piece of gum. BUT you should ask if the person wants one first cus it would be rude of you to hand it to them.
Just remember that they could also have stomach issues that make their breath smell bad. reply
Nah! I had a classmate who doesn't brush their teeth and doesn't take a bath at all SOOO I just smiled and said it straightforwardly that his breath stinks and covered my nose at the same time and laughs (〜￣△￣)〜 reply
