Neither brushing your teeth, nor rinsing with mouthwash removes bacteria-rich “biofilm” from between your teeth. The only effective way to clean between your teeth is to floss properly every day. Proper floss technique is discussed, including proper adaptation of floss to the teeth, use of an up and down motion extending beneath the gumline (sulcus); floss winding technique; and prevention of floss cuts.
SOURCE:ToothIQ.com