Age wrinkling a wrinkle in time book pdf free download the skin is promoted by habitual facial expressions, aging, sun damage, smoking, poor hydration, and various other factors. Development of facial wrinkles is a kind of fibrosis of the skin.
Misrepair-accumulation aging theory suggests that wrinkles develop from incorrect repairs of injured elastic fibers and collagen fibers. Repeated extensions and compressions of the skin cause repeated injuries of extracellular fibers in derma. During the repairing process, some of the broken elastic fibers and collagen fibers are not regenerated and restored but replaced by altered fibers. A small fold, namely a permanent wrinkle, then appears. Sleep wrinkles are created and reinforced when the face is compressed against a pillow or bed surface in side or stomach sleeping positions during sleep.