Red blood cells (RBCs) exhibit a unique deformability, which enables them to change shape reversibly in response to an external force. The deformability of RBCs allows them to flow in microvessels while transporting oxygen and carbondioxide. Low level laser therapy can affect the physical as well as chemical properties of blood cells which is not only helpful in preservation of blood but also in revitalizing the physically and chemically stressed erytherocytatory membranes . It was determined that the laser therapy decreases the viscosity of blood thus increasing the electrophoreticmobility of erythrocytes. The improvement in microcirculation is a result of all the above factors and dynamics.