What are you experience with someone that has mouth odour,especially that one that wants to share a drink with you ,with the same cup or bottle but couldn't decline because you don't want to embarrass him/her,like me now i humbly decline sharing a drink with someone at my workplace yesterday because his level of mouth odour has went extreme and intense

Introdue him to a mouth cleansing medicine by telling him you used it and the opposite gender has been complimenting your breathe lately. Don't tell him he has mouth odour.