This durable dog toy has a rotating core, which helps clean teeth and gums. The spinning core also allows you to hide "secret" treats in the toy for extra playtime fun! For example, the toy can be filled with dog toothpaste or food items such as liver paste, providing extra incentive to play and explore! The JW Apple Core Chew-ee features a specially designed surface that has a cleansing effect on teeth and gums! Let your dog enjoy the combination of play and grooming with this high-quality toy!