Researchers have identified around 150 different molecules in human breath, many of which offend the human nose. Here are what some of the more malodorous compounds smell like.
Hydrogen sulfide (H2S)
Methyl mercaptan (CH3SH)
Allyl mercaptan (C3H6S)
Allyl methyl sulfide (C4H8S)
SCIENTIFIC AMERICAN ONLINE
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This article was originally published with the title Good Bacteria for Bad Breath.