Advantage is the fast way to a flea-free home. An easy-to-use spot-on, Advantage is applied monthly. Its super ingredient stops fleas biting within 3 to 5 minutes and kills both adult fleas and larvae within 20 minutes breaking the flea life cyle. Advantage works on contact so fleas dont get need to bite to be killed. It also controls lice. Advantage is safe for puppies of any age and is water-resistant