Hills Prescription Diet T/D Feline Dental HealthHills Prescription Diet T D Feline Dental Health Hill's Prescription Diet t d Dry Cat Food is clinically proven to reduce plaque, stain & tartar buildup and clean up to the gum line. The kibble contains an exclusive matrix of fibers which act like a toothbrush to scrub the tooth to remove bacteria. The large kibble size, shape and texture cleans the teeth to the gum line to promote healthy gums and teeth. Exclusive feeding of Hill's Prescription Diet