For kittens and cats 8 weeks and older. #1 veterinarian-recommended flea and tick product. Take good care of your pets. Help keep them healthy and happy by providing preventative care starting with flea and tick control. Frontline Plus® is the #1 choice of veterinarians when it comes to combating both fleas and ticks. Frontline® Plus is an easy-to-use treatment that is proven effective.