head and shoulders shampoo. It is the best use of a shampoo for killing head lice and keeping them out. My daughter kept getting head lice from school and the school told me I had to treat her hair and bring in the boxes to prove that I had treated her hair. The first few times I did, but got upset when after a few months she would come home with head lice again. After I got head lice I knew that I had to do something to prevent this from happening again. I was spending way to much money on rid and other products and way to much time picking out nits. My daughter has  long and thick hair. We would...