Hill's Prescription Diet t/d Dog Dry Food is clinically proven nutrition to reduce plaque, stain & tartar buildup and cleans right up to the gum line. It works like a toothbrush and dental floss in one and is formulated as a complete and balanced nutritional solution for your dog's daily health regimen. Exclusive feeding of Hill's Prescription Diet t/d Dog Dry Food has been shown to be more effective than toothbrushing.