Garlic will linger on your breath for up to 24 hours, onions for lesser hours.
Chewing a clove of garlic (or eating foods made with sliced or crushed cloves) releases a compound called allicin, which breaks down into volatile chemicals that are released into the stomach and bloodstream, and then out of the body through the breath.
“When you consume foods that have phenolic compounds, these phenolics react with those volatiles and they destroy them,”
Raw apple, raw lettuce, and raw mint leaves decreased the concentration of these volatile compounds by 50 percent or more, compared to the group that drank only water. All three foods provided a significant deodorizing effect
If you’re worried about garlic breath, eat apples and raw mint.
Both were very effective ways to deodorize garlic breath.”