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Understanding the life cycle of head lice will help you understand how the various treatments options work. The female, which can live for up to three weeks, lays her eggs, also called “nits,” directly onto the hair shaft at the base of the head. Once attached, these eggs are difficult to remove, which is why just washing your hair does not work as a lice remedy. The eggs hatch six to nine days later and almost immediately start to bite the scalp for blood, their primary food source. Without proper treatment, the life cycle continues.