Made from inert soft thermoplastic polymer to satisfy the chewing instinct of teething puppies and encourage non-destructive chewing.? Bristles raised during chewing will help clean teeth and prevent tartar build up.? Designed for teething puppies - Not recommended for adult dogs or puppies with any permanent teeth Nylabone Puppy Chew toys encourage nondestructive chewing habits while satisfying the natural urge to chew|Softer material designed for teething puppies|Bristles raised during chewing help clean teeth and prevent tartar buildup