My son is 7, his school seems to be crawling with the little buggers. I wash his hair with a soap that I made with tto, just lather it up and rinse, he hasn't had them for 12 months, and I know for a fact that there are kids at that school with them. Also, I use gel in his hair to spike it up, and I mix a small amount of tto in with the gel, and then use the gel in his hair. You only have to mix the tto in once, then just use it when you need it. It works great. I will never go back to buying chemical pesticides to treat head lice, they don't work, and they are potentially dangerous. TTO really is wonderful.