Periodontal disease is the number one cause of tooth loss among adults. Around 15-20% of people have immune systems that overreact to the bad bacteria in their mouths. When this overreaction occurs, the immune system attacks and breaks down the bone and tissue that surround the tooth. This destruction is not predictable and can occur sporadically. As the onset of gum disease usually can’t be felt or noticed immediately, both adults and children should be routinely checked for gum disease.