Certifect is a fast acting, long lasting topical flea and tick treatment for dogs from Merial, the makers of Frontline. Certifect offers an effective means for killing ticks, destroying the flea life cycle and eliminating chewing lice infestations. Certifect starts working within 6 hours of application and detaches ticks attached in your infested dog, within 18 hours Certifect will completely kill the ticks. For best results, follow the instructions provided by your veterinarian or on the Certifect package. It should be only used on dogs or puppies 8 weeks or older.