Surely there is nothing (except from maybe BO, there's a bit of that around too) than smelly breath.
It is not nice to be talking to someone and then suddenly you get a reek of last night's chicken curry. I know quite a few people with this affliction and it is one of the most repulsive traits I can imagine. I don't mind ugly people, don't think of me as shallow. Their ugliness is their own, but smelly breath ATTACKS you! Smelly breath is an assault on the nose. It distracts me from the conversation and I generally just want to get away. I don't understand how people can get it, is brushing your teeth twice every day too much to ask?
Post your incidences of smelly breath, and also if you are one of the aforementioned carriers of the breath syndrome, in case I ever meet you, do us all a favour and brush your teeth.