Dry 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.
Is often based on corn starch or rice starch.
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.
Proponents attest that daily wash-and-rinse with detergent shampoo can strip away natural oils from hair. However, others attest that spraying 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.
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.