Figure 3: Drawings illustrating tissue reaction due to pressure from orthodontic appliance indicated by black arrows. The root-close tissue layers are explained in Figure 1. (a) Shows the tissue layers before reaction due to appliance. (b) Illustrates the compression of the tissue layers due to force from the orthodontic appliance. (c) Shows the bleeding or lymph secretion after pressure and (d) suggests how inflammation due to the pressure is followed by resorption processes (blue-purple shadow)