Regular use of a flea comb can help uncover fleas, flea dirt, and flea eggs from your cat’s fur. As you brush, the finely spaced stainless- steel teeth collect fleas, flea dirt and flea eggs so that they can be easily eliminated. HOW TO USE: To make sure that flea eggs do not end on the floor of your home, use comb outside or in a bathtub. Hold comb firmly in the hand and run the teeth gently through the fur in the direction of growth from the head to tail.