Tartar, also known as calculus, forms in your dog's mouth when plaque—a soft, sticky substance—builds up on the teeth. If plaque is not removed, it hardens over time due to minerals in the dog ...
And they are designed so that when the dog bites in to it in an essence, pulls the tartar and plaque off of their teeth. There is always the potential with those hard diets, however, that pets can ...