The question "can you get lice from not washing your hair" is a common misconception that has been circulating for centuries. Lice are tiny, wingless insects that feed on human blood. They are spread through close contact with an infected person or by sharing personal items such as hats, scarves, or combs.
Washing your hair does not kill lice, but it can help to remove nits, which are the eggs of lice. Nits are often attached to the hair shaft and can be difficult to remove. Washing your hair with a lice shampoo can help to loosen the nits and make them easier to remove with a fine-toothed comb.