I have two daughters, both with long hair, and headlice are a complete and utter pain. The ONLY thing I have found to work is sitting there, plastering their hair in conditioner, and comb, comb, comb... a cheapo nit comb just as good as the expensive ones. You have to do this for days on end, but it is the only way i've got rid of my girls headlice, they seem really resilient these days. Tea Tree is meant to help so I use tea tree conditioner. You have my sympathy!!!