I've used frontline for years on my other cats. I recently got a new 13 week old kitten who was covered in big fleas. Someone said to me to bath him, but I know it's bad for cats and I didn't want to scare him in his new home! so I used frontline. Within 3 hrs nearly all the fleas were dead/ gone. I make sure I use this every 5 weeks on all my cats as fleas drop over 300 eggs a day onto your cat/carpet and can stay unhatched for 13 weeks!
Don't mess the cat around trying different products. Its so easy to put on and now non of my cats even flinch when I put it on them. My oldest cat is now 15 and I have used frontline his whole life, he's not even got a grey hair! very happy/healthy cat.