If your scalp is oily, you may need to wash it as often as once a day.If you have chemically treated hair, your hair may be drier, so you may want to wash it less frequently.As you get older, your scalp makes less oil, so you may not need to shampoo as often. But if you see flakes in your hair, you may not be shampooing enough. This can lead to dandruff and other scalp diseases.Concentrate shampoo on the scalp. When washing your hair, concentrate on cleaning primarily the scalp, rather than washing the entire length of hair. Washing only your hair can create flyaway hair that is dull and coarse.Choose a shampoo and conditioner formulated specifically for your hair type. For example, if you color your hair, use a shampoo designed for color-treated hair. If your hair is damaged or chemically treated, consider a “2-in-1” shampoo. Regardless of cost, many shampoo and conditioner brands provide the same benefits.