Thumb-sized device quickly ‘sniffs out’ bad breath

No one wants bad breath—not when visiting friends and
family, at a job interview, and especially not on a first date.
Smelly breath can make things awkward, but it also is a natural
warning sign, indicating that serious dental issues are occurring.
Now, researchers reporting in ACS Nano have constructed a portable,
thumb-sized device that diagnoses bad breath by quickly “sniffing”
exhalations for the gas that makes it stinky—hydrogen
sulfide.