Coffee
As life-changing as coffee may be, chugging it before a big interview or meeting is a major no-no. Coffee has a powerful smell that sits in the mouth, says Napoli. So skip the cup of joe and opt for green tea instead.
Alcohol
Alcohol is a diuretic, which can dehydrate your body. Meanwhile, it decreases your levels of saliva, leaving your mouth the perfect environment for bad bacteria to hang. However, vodka has properties similar to mouthwash that can kill bacteria.
Canned Fish
Any fish that comes out of a can is going to carry a stench. And when you lunch on tuna, that smell isn’t going to disappear. When fish gets tinned, it begins to oxidize, which is why they have a scent. This smell clings to your mouth, giving your breath an unpleasant fishy odor. Ew.
Tomatoes
Foods high in acid can do some serious mouth sabotage. “Odor-producing bacteria thrive in an acidic environment, so it’s best to avoid eating an excessive amount of acidic foods like citrus and tomatoes if you can’t wash out your mouth soon after,” says Sharp.