Safe for people and pets, Natural Chemistry Flea & Tick Spray kills fleas on contact without the use of pyrethrin based pesticides. It's also effective on ticks and lice. For use on bedding, carpets, furniture, and directly on your dog or cat. Parasites do not become resistant, so the product never loses its effectiveness. Natural Chemistry Flea & Tick Spray can be safely used in conjunction with spot-on products. The active ingredients in Natural Chemistry products work together to soften the waxy exoskeleton of fleas, ticks, lice, mites, and other insects. Once the insect's armor has been penetrated, its internal organs are saturated and the insect quickly bursts. Natural Chemistry Flea & Tick Spray works for all stages of an insect's life cycle, eggs, larvae, pupae and adult--effectively eliminating all insects from the home.