Everyone knows that certain foods can cause bad breath. For instance, garlic and onions are notorious for lingering unpleasant odours in the mouth. However, other foods can also cause bad breath, even though they might not be as obvious. For example, spicy food can irritate the mouth and throat, leading to inflammation and increased bacteria. Likewise, sugary foods can promote the growth of bacteria, which can cause bad breath. Lastly, certain fish contain oils that can also contribute to bad breath. Avoid offending others with your breath by avoiding these foods altogether. However, if you eat them, brush your teeth afterwards to help remove any odours or chew some sugar-free gum with Xylitol.