Natural Look Pyrethrum Lice and Nit Spray is especially designed to penetrate longer and thick hair types. Spray once a day for at least 10 days, ensuring the product penetrates throughout the entire head of hair, taking care not to spray directly onto scalp or into eyes. You will ensure maximum benefits of preventing and controlling head lice and their nits (eggs) when used in conjunction with the other NATURAL look Pyrethrum Care Regimen.