Frequent shampooing will wash away the oil secreted by sebaceous glands of the scalp, reduce the natural protective film of the scalp and hair, accelerate the metabolism of the stratum corneum of the scalp, and easily cause dryness of the scalp and hair, which is not good for the health of the hair. However, if you need to wash your hair every day because of work or personal habits, it is recommended to pay attention to the care of scalp and hair after washing your hair. It is usually recommended to wash it about three times a week. If the weather is too hot and you often sweat, you can appropriately increase the number of shampoos.