For the Nutritional Management of Dogs with Dental Disease By the age of three your dog could begin showing the signs of dental disease. This painful and potentially serious problem is most usually a result of tartar build up at and under the gum line. Prescription Diet Canine t/d was formulated specifically for the nutritional management of dogs with dental disease. Because your pet can't brush his own teeth, the build-up of tartar can lead to periodontal disease, a dental condition that can weaken the gums and tissues that support the teeth. ONLY AVAILABLE IN AUSTRALIA - QLD, NSW, VIC AND ACT