In many Western countries, rinsing after brushing has been passed down through generations, often reinforced by advertisements showing people swishing water after cleaning their teeth. Many believe that washing away the minty foam is essential for a clean mouth and fresh breath. Professor Nicola Innes, Head of Paediatric Dentistry at the University of Dundee, has studied behavioral factors in oral health. As for mouthwash, dentists recommend using it at a different time of day, such as after lunch or before bed — not immediately after brushing — to avoid washing away fluoride from toothpaste. Changing your post-brushing routine is one of the easiest ways to improve oral health without spending a single extra minute in the bathroom.