You brush your teeth twice a day, maybe even use mouthwash, yet that unpleasant smell seems to return. It can be frustrating—and it doesn't necessarily mean you're brushing incorrectly. Brushing is important, but it mainly cleans the surfaces of your teeth. Odour-causing bacteria can also hide on the tongue, between teeth, around the gums, or become more active when your mouth is dry. Persistent bad breath, known medically as halitosis, can sometimes also be linked to dental