Before using, groom your cat with a Safari cat comb or brush to remove mats and tangles that could damage the teeth of the flea comb. If needed, apply flea treatment before combing. Comb your cat slowly, periodically checking the teeth of the comb for fleas or debris. Pay particular attention to areas around the ears, nape of neck and base of tail. Between strokes, dip the cat flea comb in a cup of water with mild detergent to kill the fleas left on the comb.