Hair breakage can be caused by a number of reasons, most of which are caused by a lack of hair nutrition, such as perm and dye damage to the hair, hair from the outside to the inside in the order of the hair cortex, cortex and medulla. The hair is made up of a thin and transparent layer of keratinized cells, which overlap each other like layers of tiles. Dyeing and perming mainly damage the hair microdermis, which is not renewable. In addition, mental tension, insomnia, lack of trace elements and protein and other nutrients can also lead to hair loss. Therefore, daily life should be balanced nutrition, adjust the lifestyle, avoid high temperature hair dryer hair, reduce perm and dye and choose the right shampoo for your hair to reduce the occurrence of hair loss.