Neem oil is the best cure for head lice
I have used Neem oil for my daughter & it has been a blessing!
I am no longer worried about her getting lice at school. Anytime this happens, all I need to do is dilute 2-3 drops of Neem oil with normal hair oil (e.g. coconut / olive oil), apply to her scalp, leave on for 10-15 minutes, comb out with a fine toothed (lice) comb and wash off with a regular shampoo.
I need to repeat this about 2, or 3 times and the lice are all gone!