The Nylabone Edible Chew & Brush Dental Bone is all natural and contains no plastic and no added salt. The unique patent-pending ridge design has been developed by scientists adn veterinarians. The extra surface area scrapes the teeth clean and helps to reach areas that ordiary smooth dental bones might miss. Chew & Brush bones are long lasting and fortified with chlorophyll, parsley and calcium. Good dental care should include frequent use of Chew & Brush bones and regular visits to your veterinarian. Always choose the right size bone for your dog.