Dental Kong® Toy, Large/X-Large - Fun oral health care! DENTAL KONG's patented "chew-clean" grooves effectively squeegee clean dog's teeth and gums as they chew. Dog toothpaste can be used inside the grooves if desired. The large and extra-large sizes are bone-shaped with hollow centers to hold treats. Large = 5" long and X-Large = 6.5" long.