Just spray on non-toxic Licefreee Spray and it starts killing head lice and nits on contact. Since 1999, the Licefreee brand has changed the traditional approach of head lice remedies by effectively killing head lice and lice eggs (nits) without using chemical pesticides. Just spray Licefreee onto dry hair and saturate the hair, allow it to air dry, and you're done! 100% Guaranteed. Safe for children as young as 6 months. During the time she was developing Licefreee, Wendy ""visited schools and homes, put ads in the paper and posted 'lice wanted' flyers to gather lice to use in the laboratory experiments."" She wanted to be absolutely sure she ""had the most effective product she could make."" Wendy also smiles as she recalls that ""large, magnified lice haunted my dreams during that perio.