Full Marks Head Lice Solution is clinically proven to kill head lice quickly. The simple treatment takes no longer than 10 minutes. Contains cyclomethicone & isopropyl myristate, which cause the lice to to die through dehydration. Eliminates eggs. Fine metal tooth comb included in the pack. Low odour, no traditional pesticides. Suitable from 2 years and over, including those with asthma and sensitive skin.