A child has head lice, make the hair a little damp and then add a dash of vinegar.
Well let about half an hour, then rinse and repeat two or three times and the lice are dead.
Rinse your clothes with lavender fabric softener and lice stay away. lice and lavender do not mix.
Tea Tree shampoo, or regular shampoo with 10 drops of tea tree oil mixed through it, they do not survive!