Hair care is a highly personal choice. There is rarely a medical reason to wash hair at all. So the decision about how frequently to wash hair depends on a person’s hair type, scalp texture, how oily the hair gets, and personal preference.
For some people, too-frequent washing can cause damaged hair and a dry, itchy scalp. For others, infrequent washing can make the hair look greasy and lifeless.
Why shampoo your hair?
Washing the hair is a lot like washing skin. Water can remove most visible dirt and debris, but might not eliminate odors or oily deposits. Shampoo helps water remove dirt, debris, and odors, such as smoke or sweat effectively.
Shampoos can also remove oil. The hair gets its oil from sebaceous glands that secrete oil called sebum, which keeps the hair moisturized.
Moisturized hair is less likely to break or look dry and frizzy. But too much moisture can make the hair look greasy, limp, and dirty. After several days without shampooing, oil tends to build up closest to the scalp, making any hair around the face look dirty. Most shampoos are designed to strip excess oil, which helps the hair look cleaner for longer.