We have had fleas for three weeks. We administered frontline, which I am not all that pleased with to be honest at the beginning of July. We have been vacuuming and cleaning like nuts just like they say. We used a spray with Nylar about three weeks back too and we put down borax. The borax is causing problems for me and I am probably going to have to rent a cleaner for the carpet. My one kitten is still itching and I think they still have some but not as bad. We are hopefully getting them into the vet tomorrow. What is the best flea preventative other than frontline? Also, I am looking for a spray for the house. I cannot use any more powder products as they are hard on my lungs. I have heard of Ortho Home Defense. Any advice is appreciated. Thanks so much….