Why Can Garlic Remain on Your Breath After Brushing?

Some garlic odor stays in the mouth, but the most persistent part may return through the lungs.

Cutting or crushing garlic breaks plant cells and allows an enzyme to transform a compound called alliin into allicin. Allicin then breaks down into several sulfur containing substances responsible for garlic's powerful smell.

Many create the immediate odor and can be reduced by brushing, rinsing, or cleaning the tongue. One compound, allyl methyl sulfide, behaves differently. The body does not break it down quickly.

After garlic is digested, this compound passes from the intestine into the bloodstream. Blood carries it throughout the body and eventually to the lungs, where it enters exhaled air.

This means freshly brushed teeth cannot completely remove the odor. Its source is no longer only between the teeth or on the tongue. Some may also leave through sweat and urine until the body gradually clears it.

Studies have found that certain foods, including milk, apples, lettuce, and mint, can reduce some garlic compounds, particularly when consumed with the meal. However, no mouthwash can instantly remove a molecule already circulating in the blood.

Garlic breath can survive perfect cleaning because part of it is being breathed out from inside the body.