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Hair loss is experienced by all of us at one or the other time. To know the causes of hair fall, it is very essential to know the structure of hair and its normal growth cycle.Structure of hairThe hair on our scalp can be divided into two parts, the root and shaft. The root part of hair is in the skin (epidermis) of scalp. The hair root is surrounded by a pouch like structure called follicle. The base of hair root is in the shape of a bulb. This bulb is indented by capillaries and nerve fibers. The cells in the center of bulb divide. The newly divided hair cells push the previous cells up. The cells which move upwards die slowly forming hard hair shaft. The hair shaft has three layers the cuticle, medulla and cortex. Cuticle is the outer layers and protects the inner layers. It is transparent.However, a person needs heat to style her hair. If she wants to reshape her hair or direct it to follow a certain style, heat is often necessary. Not all thermal devices will cause damage to your hair. Other styling tools will leave your hair smooth and shiny. Take the tourmaline hair dryers for example. It will leave your hair bouncier and more healthy looking after drying. Although it uses heat, it will still make your hair look fabulous. If you want to make sure that hair remains healthy even if you are using thermal devices, make sure that you have a good product. You do not have to get the kind that salons use on their customer, but that remains an option. You can find different styling tools that will not leave negative effects on your hair. If you do not know how to shop for the right type of thermal tools, choose those with ceramic and ionic plating.