Daily brushing and flossing helps to prevent the buildup of food particles, plaque and bacteria in your mouth. The tongue holds 75% of all the bacteria in the mouth. TONGUE SCRAPING is essential to good oral hygiene and sweet breath. Food particles left in the mouth deteriorate and cause bad breath. While certain foods, such as garlic or anchovies, may create temporary bad breath, consistent bad breath may be a sign of gum disease or another dental problem, or a dirty tongue.