Periodontal disease affects more people worldwide than any other illness, according to the Guinness World Records. It destroys gum and bone, eventually causing teeth to fall out. Periodontal disease may also be linked to life-threatening illnesses, such as pneumonia and diabetes. One drawback of standard treatments is that it's difficult to restore damaged tissue. But a drug developed in Japan regenerates gum and bone, and saves teeth. We'll also look at ways to maintain good oral hygiene, even when disaster strikes.