Lice Video Lice live their entire lives on the head, feeding on blood.. The adult female head louse lays her eggs (nits) near the scalp. The eggs hatch in about 9 or 10 days. The newly hatched louse (nymph) will suck blood for food and develops into an adult over a 10-day period. The entire life cycle is about 3 weeks. Call 212-759-5200 to have all your head lice questions answered by a highly competent Licenders head lice removal clinician
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