Why does garlic have a special odor?

After eating raw garlic, the mouth often emits a unique unpleasant odor, which is taboo in daily communication. Complete garlic has no odor and only has an odor when consumed, cut, squeezed, or damaged. This is because the allicin in intact garlic is colorless and odorless, but there is also an alliinase present in garlic cells, and when the two come into contact, they form allicin with a strong spicy odor. Garlic capsaicin is the source of garlic's unique odor.