You should floss to reduce the number of bacteria in your mouth. This bacteria lives in plaque which can be removed by flossing. Brushing your teeth gets rid of some of the bacteria in your mouth. Flossing gets rid of the bacteria your toothbrush can’t get to. Brushing without flossing is like washing only half of your face. The other half remains dirty.   Ask your dentist to show you the proper way to floss. You will both notice the difference at your next cleaning appointment.