7 How To Eliminate Bad Breath After Eating Onions Tackle bad breath due to certain foods is usually simply by brushing your teeth or gargle with mouthwash. However, it is not the case if the cause of Your bad breath is onion, especially red onions, onions and raw garlic. Often, brushing my teeth alone will not dislodge the scent of onions from your breath. Garlic and other members of the