Licener is an easy-to-use head lice shampoo that kills head lice and their eggs in just one single application of 10 minutes, with no combing required. The shampoo contains the active ingredient, Neem-extract. When applied according to the directions the extract covers, immobilises and suffocates lice causing them to die. It also penetrates tiny openings at the top of the eggs called aeropyles (breathing holes) blocking the oxygen flow which causes the carbon dioxide to build up and the nits suffocate and die also. The Neem extract will also break down the protective shell of the (eggs) nits. Therefore Licener kills both the lice and nits in a single treatment.