Dry shampoo is not designed to kill lice. Lice are parasitic insects that live on the scalp and feed on human blood. Dry shampoo is typically used to absorb excess oil and refresh the hair between washes. While it may help to temporarily reduce the appearance of lice by absorbing oils and making it harder for lice to cling to the hair shafts, it is not a reliable method for eliminating lice infestations.

To effectively treat lice, it is recommended to use specific lice-killing treatments that are approved by regulatory bodies, such as medicated shampoos or lotions containing active ingredients like pyrethrin or permethrin. These products are designed to target and kill lice and their eggs (nits) effectively.

It's important to follow the instructions provided with lice treatments carefully and to also comb the hair with a fine-toothed comb to remove any remaining lice or nits. Additionally, it is crucial to wash or dry-clean all bedding, clothing, and personal items that may have come into contact with the infested person to prevent reinfestation.