Full Marks Solution In just a 10 minute treatment time, Full Marks Solution is clinically proven to kill head lice. It has no nasty smell & is suitable for asthma & eczema sufferers. Furthermore, Full Marks Solution does not contain traditional pesiticides. As a result, a second treatment is required after seven days, in order to kill any newly hatched head lice.A nit removal comb is also included in every pack. Ingredients Active ingredients: Cyclomethicone & Isopropyl Myristate. Directions Adults & children over 2 years: Apply to dry hair. Leave for 10 minutes. Comb through hair with comb provided to remove any lice & eggs that remain. Finally wash out the solution using non-conditioning shampoo. Children under 2 years: Not recommended. Suitable for people with asthma & eczema. Always read the label.