How do tu tell someone that their breathe stinks without being rude?

"I'm bored. Let's drink mouthwash "

Depends if that person close to tu just be honest and direct.

Offer them a mint o chewing gum :D If they don`t get the hint, insist that they would need it

Just be rude, fucking do it

always carry a pack of gum and offer them one.
o mints. ^^;;
i really can't think of a nicer, subtle way of doing so ^^;;

Ask 'em "what have tu been eating today?" o "did tu forget to brush your teeth today?"

start with "I'm sorry but"

First tell "Ooh my breath stinks like shit!" Then practice oral hygiene knowingly and drink a fucking glass of water and eat some damn chewing gum.
Then drop por a mint mouthwash and they'll get that they were being a salty smelly af.

"DEUUEAUGH"