This little comb has helped me get rid of the fleas on my cats. I'm using it in conjuction with Frontline Plus and Sipotrol spray. It helps me find the ones that are left and is a good indicator of whether you have the problem licked. One of my cats has very dense fur and still had some fleas after repeated applications of Frontline. You have to devise a system for killing any fleas that you comb off.