What is it supposed to do? Is it only prevent fleas? Or cure too? I have a complaint and want to complain to them that I have wasted my friggin money, but wonder if they will come back with "Well, it is a preventative treament". I found a flea on Teddy and it is so much cheaper than Frontline (which if i'd had the money I would have bought). I figured getting a cheaper one is better than nowt. Turns out nowt would have been better! Any recommendations on a good flea treament. I now have two to treat Urgh, hate the horrible evil little things (the fleas, not the cats ).