This painful and potentially serious problem is most usually a result of plaque and tartar buildup at and under the gum line. Prescription Diet® t/d® Canine dog food is formulated specifically for the nutritional management of dogs with dental disease. It's special fiber matrix scrubs the exposed tooth surface like an edible toothbrush, reducing bacteria-laden plaque. If left unchecked, this buildup can lead to gingivitis, a dental condition that can weaken the gums and tissues that support the teeth.