Unique toothbrush design features bristles for increased brushing surface, and a grooved shaft and contoured end for optimal tooth penetration. The unique shape includes “bite-size break points” and a chewy texture for better teeth cleaning right down to the gum line. Greenies include a unique blend of soy and wheat protein isolates combined with vitamins and minerals for complete and balanced nutrition (for adult dog maintenance) that is highly soluble and easy to digest, along with the same great Greenies taste dogs love. Select the proper bone size that best meets your dogs weight. Teenie 2 3/ 4″ for dogs 5-15 lbs.