FRONTLINE PLUS provides your cat with complete protection against fleas in the following ways: Breaks the flea cycle at every stage ? it kills all 4 stages including adult fleas, flea eggs, larvae, and pupae, when applied monthly. For tick control on cats, use?FRONTLINE SPRAY. For use on kittens over 8 weeks of age. Safe for use on breeding, pregnant and lactating queens. Waterfast ? so it can be used on cats that are shampooed between treatments. However, always ensure your cat is completely dry before applying FRONTLINE PLUS, and wait 24 hours before wetting your cat again. Treats and controls?Flea Allergy Dermatitis. Treats and controls biting lice.