Spray Pyrethrum Lice Oil Spray through the lice infested hair and scalp. Leave for at least 30 minutes. Lice Oil starts to act immediately. Comb the hair with a fine toothcomb – from the scalp to the ends of the hair – to remove head lice and nits during this time. Hair and scalp can be cleansed with NATURAL look Pyrethrum Shampoo following this stage. Contains: concentrated 100% natural oils, pyrethrum, lavender, citronella and tea tree to repel lice naturally.