That’s because minced or crushed garlic (the manner in which we normally eat it) releases four volatile sulfur compounds to which our olfactory systems are particularly sensitive.
The biggest culprit is allyl methyl sulfide, which metabolizes more slowly than the others, keeping it at a higher concentration in the body for a longer period. After ingesting garlic, the potent compounds are absorbed into the bloodstream, then become vaporized while going through the lungs. The result: bad breath.
Doctors reported on this phenomenon for the first time in 1936. A patient given garlic soup through a feeding tube had garlic breath hours later, even though the food never touched his mouth.
“Twenty-four hours after consuming garlic, you can still smell it,” says Sheryl Barringer, a professor of food science at Ohio State University and author of a 2014 Journal of Food Science paper on how various foods react with sulfur volatiles.
A patient given garlic soup through a feeding tube had garlic breath hours later, even though the food never touched his mouth.
To mitigate the strength and duration of the offending compounds, munch on an apple or raw mint after a garlicky meal, Barringer says. The polyphenolic compounds in both are proven to neutralize the garlic volatiles. Eating parsley or drinking milk, especially with your meal, will also help tame garlic breath, as will green tea and lemon juice.
But flossing and brushing your teeth are just as important. “If there are still tiny particles stuck back there, you will continue to have garlic breath,” Barringer says.
http://www.popsci.com/why-is-it-so-hard-to-get-rid-garlic-breath
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