NATURAL look Pyrethrum Lice Oil can be sprayed through the lice infested hair and scalp. It starts to act immediately and it should be left on the hair for a minimum of 30 minutes. During this period the hair should be combed through with a fine tooth comb from the scalp to the ends of the hair to remove head lice and their nits. Following this stage hair and scalp can be cleansed with NATURAL look Pyrethrum Shampoo. Contains: concentrated 100% natural oils, pyrethrum, lavender, citronella and tea tree to naturally.