Sebaceous oils are natural hair moisturizers. Some of us produce more of it than others, depending largely on skin type and hair texture. Dermatologists caution that washing your hair too often can dry out your scalp and cause it to produce more oil in response. Your hair may lose body and become dry and brittle, too. Columbia University suggests most people do not need to wash their hair every day. Generally, cleansing the hair once weekly is sufficient. Some experts suggest using a dry shampoo to alleviate excess oil buildup between washes.

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