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 For puppies up to 15 lbs. Entertaining colors and textures keep your puppy busy Fun shapes for added intrigue