A liquid substance intended to be applied to the scalp and head hair as a hair cleansing shampoo to eradicate/protect against human head lice (Pediculus humanus capitis) through physical means. It contains agents that kill lice and/or protect against lice infestation through a non-pharmacological action (e.g., encapsulation, dehydration); it does not include a lice comb. After application, this device cannot be reused.