If I use malathion to kill head lice, will I have to repeat it?

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If you use malathion (Ovide) to kill head lice, you may have to repeat the treatment. After using malathion on the hair and scalp of someone with head lice, use a fine-toothed comb to remove dead lice and their eggs. Using the comb, check for lice every two or three days. If you find live lice seven to nine days after using malathion, repeat the treatment.