This Sulfate Free, Non-Toxic Preventative Shampoo will smell pleasant to you and your child, but not to lice. Our Natural products attack the louse’s olfactory nerves. Since lice move to new hosts primarily through head-to-head contact, they are less likely to move to a head that smells like this “stinky” shampoo. This product cleans and detangles hair. It can be used several times a week.