Quitnits Once Only treatment kills lice and their eggs in one application. Shampoo afterwards and comb with the included nit comb. This product coats the louse, which stops it from exchanging gases and moisture with its environment, leading to suffocation.Contains ingredients effective against super lice (against malathion and permethrin resistant lice)Scientifically tested ingredientsGentle on skinProducts containing Dimethicone are well tolerated during pregnancy.