Even if if smells "good", like fresh chewing gum, candy or toothpaste. I don't want to smell it. I think it's gross anyway and it makes me feel uncomfortable. Unless it's my girlfriend (which is non-existent btw but that's a different story).
But it could be worse. Like when someone's breath smells like cigarettes and coffee that have reacted with bacteria. I know how that smells and it smells absolutely disgusting.
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It's just weird to do it in general, especially if the person has bad breath (even though it's inevitable when talking to somebody, it distracts from the conversation).