Kick fleas, ticks and chewing lice to the curb with PetArmor Plus Flea & Tick Topical Treatment for Cats! PetArmor Plus is a waterproof, long-lasting formula that works to kill adult fleas and ticks plus stop the flea cycle dead in its tracks. Each dose offers up to one month of continuous coverage for most cats ages eight weeks and older. The fast-acting topical formula starts working within 24–48 hours. When it comes to flea and tick control, protect your kitty with confidence using PetArmor Plus!