I stand firmly behind Frontline as being one of the best flea killers and flea prevention products on the market. It is nice because you don't need a veterinarian appointment to get it. If you have a significant flea problem, using Frontline for two or more consecutive months will help eradicate your flea problem. Just be sure to treat all animals as well as your floors and furniture if needed. A little pricier than its competitors but definitely worth it if you want a flea-free Home and Living area.