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, soft texture designed to be safe for your dog's gums BITE RESISTANT MATERIAL - The KYONNE dog toothbrush is made from a strong TPE material that is intended to be bite resistant, but not bite proof. 100% Satisfaction: 60 Days money back guarantee. Simply contact us through your order history if you have any question, or if you are not satisfied for any reason and we will replace it or issue you a full refund.