The Halo Hair Preventative spray is highly recommended after using the Halo Hair Shampoo & Halo Hair Conditioner. After getting rid of head lice, it’s important to keep them away! Repel lice so they will find a new home. Lightly spray product on clean hair and style. This product (and all of our products) is 100% natural and good for your hair. It is water-based, so it will dry naturally and leave your hair looking clean.