Periodontal (gum) disease is an infection of the gums and bone that hold your teeth in place. Typically, periodontal disease occurs when plaque builds up on the teeth and hardens, often due to poor brushing habits. The gums can become swollen and red in the early stage of the disease, called gingivitis. As the disease advances, periodontal disease can lead to sore and bleeding gums, pain while chewing and tooth loss