Rub Your Teeth After Lunch (IMAGE) University of Gothenburg Caption "This "massage" method proved to be at least as effective as a third brushing in increasing the amount of fluoride in the mouth," Anna Nordström explains. Credit Photo: University of Gothenburg Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.