That furry buildup on your tongue harbors bacteria that can migrate to your teeth and gums, reducing the effectiveness of your morning brushing routine. It can also contain smelly sulfur compounds that cause persistent bad breath. One nifty tool in the fight against halitosis and tooth decay is the handy tongue cleaner available with some water flossers. It's actually a gentle scraper that removes tongue film and gently washes it away in one easy step. Used in conjunction with regular brushing and flossing, the occasional tongue cleaning can help protect your teeth, gums and breath by giving tongue-dwelling bacteria the boot.