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Hair can define your image and style but is also a mirror of your health. The power of a healthy-looking, shiny head of hair to make you feel good and make others turn their heads is extremely strong. However, keeping hair in peak condition is a combination of caring for it on the surface and nurturing it from the inside. Like the rest of your body, your hair is affected by diet, exercise and stress. Emotional or physical problems can soon result in a lack of bounce or shine. Unlike the rest of your body you can change its colour, shape and style on a whim depending on your mood.
Structure
Hair grows at a rough rate of 12mm a month and can have a lifespan of from three and six years. The hair root cells are some of the most rapidly developing in the body and are extremely sensitive to changes in diet, hormones, stress levels and even weather. Hair is lubricated by the production of sebum, the skin's own protective oil. Each strand of hair originates in a bulb-like follicle beneath the surface of the skin and is made up of three layers: the cuticle (a protective outer layer), the medulla (an inner hollow core) and the cortex, strengthened by the protein keratin, which lies between. When the cuticles lies flat, the hair reflects light and looks shiny and healthy. If the cuticles are roughed up by, for example, excess heat or harsh chemicals, the hair looks dull and dry.
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