Over it with Tea Tree Oil
My two girls came home with head lice and we treated it with Nix and other lice treatments. However, this didn't work. They still had it. We fought it for about 6 months when finally we read on the internet about tea tree oil.
This is what we did. We bought unscented baby shampoo; this because it doesn't have any type of additives in it. We put an ounce of 100% tea tree oil in a 20 ounce bottle of baby shampoo. We then put it on their dry heads and lathered it in really good. Paying extra attention behind the ears and on the nape of the neck. We then covered their heads with a shower cap and left it on for about 30-40 minutes. We rinsed it out and made sure we didn't get it in their eyes.
There was nothing left alive. We then combed out and got rid of all the nits. Tea tree oil is an amazing treatment! We also put about 5 or 6 drops in their shampoo bottles (16oz bottles) and whenever they wash their hair when they take showers and wash their hair they use that. This is a safety precaution to prevent them from getting them again. Tea tree oil acts as a repellent.
We also put a few drops in a bottle of Febreeze and spray all of our furniture, carpets, curtains and drapes. The little buggers don't like it. It's a good idea to also put a few drops of it in your laundry detergent also.