Full Marks Solution Spray Head Lice Treatment 150mlFull Marks Solution Spray is a fast and effective, 10 minute treatment that kills head lice and eliminates eggs. It dosen't poison the lice like traditional head lice treatments, but rather causes them to dehydrate and die. A detector comb is also provided and can be used to remove these dead lice along with any eggs. Ingredients Cyclomethicone, Isopropyl Myristate