Why does Dr. Alan Macdonald recommend daily flossing? 90% of tooth decay occurs between the teeth, flossing can prevent this decay. That is because flossing is a vitally important part of your oral hygiene routine. By removing plaque that accumulates between your teeth, flossing aids in prevention of tooth decay and gum disease. Plaque consists of bacteria that can attack your teeth and gums. When brushing your teeth you only reach about 60 % of the tooth surface. Flossing ensures that you reach the remaining areas. To learn more about flossing and techniques subscribe to our email list to receive latest news on flossing, technique, answered questions and much more!