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The outermost layer of the skin. The epithelial layer is a waterproof, protective wrap around the body. Through the process of keratinization, the cells of the epidermis are replaced about every 27 days. It has five layers. The top layer, called the stratum corneum, is composed of 15 to 350 layers of dead skin cells and the waterproof substance called keratin.

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Lauren Stewart
By: Lauren Stewart

Lauren Stewart is a freelancer writer from Michigan. She enjoys writing about beauty, health and fitness! She is passionate about learning new ways to take control of her health and wellness and is a makeup and skincare junkie! You can contact her by emailing