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The TUNG brush and gel were designed by dentist Dr. Wieder to be the most effective tongue cleaner ever. In fact, 90% of consumers preferred the TUNG Brush and TUNG Gel in a study conducted by Nova Southeastern University. Our tongue brush is designed specifically to clean the rough but tender surface of the tongue. Our tongue gel is formulated to neutralize that nasty bacteria gas that causes bad breath, leaving your mouth minty fresh.