A 5-minute treatment that's effective in just one use. Used as directed, Full Marks Solution and the removal comb will kill head lice and eliminate eggs. Unlike traditional head lice treatments, Full Marks Solution has a physical action on the lice, causing them to dehydrate and die. They can then be removed along with any eggs using the Full Marks Removal Comb supplied. This product has been clinically proven to kill head lice and eliminate eggs, without using traditional pesticides. The comb is included. Product contains solution treatment and comb.