do nits hatch after falling off calculate how long you have had lice how lice live understanding head lice head lice life cycle how long do lice how do lice survive lice clinics of what is head lice life cycle how long how many lice are usually found on a head lice lessons head lice removal and how long do lice live on a mattress head lice facts of lice the lice lounge the head lice life cycle lice clinics what do i do if i have nits but no lice