https://en.wikipedia.org/wiki/Dry_shampoo
Dry shampoo otherwise known as hybrid shampoo is a type of shampoo which reduces hair greasiness without the need for water. It is in powder form and is typically administered from an aerosol can. Dry shampoo is often based on corn starch or rice starch.[citation needed] In addition to cleansing hair, it can also be used as a tool for hair-styling as it can create volume, help tease hair, keep bobby pins in place, and be used in place of mousse in wet hair.[1] Dry shampoo proponents attest that daily wash-and-rinse with detergent shampoo can strip away natural oils from hair.[2] However, others attest that spraying dry shampoo every day will lead to a build-up of product that can dull hair color and irritate the scalp, arguing that the scalp needs regular cleansing and exfoliating to get rid of bacteria, remove dead skin cells, and stay healthy.[3]
The powders within dry shampoo are meant to absorb the sebum in hair, which is excreted from sebaceous glands and can give hair a greasy appearance when the oil is overproduced. By absorbing the oils, the greasy appearance of the hair is improved; however, the absorbed oils and powders remain in the scalp, so the hair may appear clean but feel unclean to the user.[4] The user may need to wash their hair with traditional shampoos to actually remove the oils and dry shampoo powder in order for the scalp and hair to feel and appear clean.
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