I have never had a problem with fleas, but I did see a few ticks on my baby this summer. YUCK!
I use Frontline as well. It works great. But I couldn't understand why my baby got ticks and they didn't die or fall off. Especially since Frontline works for fleas and ticks.
After talking to my vet I found I was giving him a bath to much. I would bathe him once a week because he likes to pee on himself.
But the vet said that frontline works in the oils in their hair as well and if I was bathing him alot the frontline wouldn't work as well.
So I decided during the summer to use a flea and tick shampoo along with frontline. This worked great.
Good Luch!