3 sizes of dog toothbrushes: Suitable for all Small Medium Large Dogs. Choose the right size based on the size of the dog. Made of high quality rubber, nontoxic ,durable, 360-degree bristle configuration, bite resistance and easy to clean Encourages Pets to Clean Their Teeth Every Day Bristly Brushing Stick is desiged to clean teeth on both sides and is angled to fit comfortably in your pet's mouth Usage: Allow your dog to chew on the Brushing Stick for Dogs for about 10 minutes at a time. This is enough time to clean his teeth, but not so long that he ’ll get bored of it. When his or her 10 minutes are up, you should take the stick and put it up until next time.