http://en.wikipedia.org/wiki/Periodontics

Periodontal disease is an infection of the tissues that support your teeth. It is possible to have periodontal disease and have no warning signs. That is one reason why regular dental checkups and periodontal examinations are very important. Treatment methods depend upon the type of disease and how far the condition has progressed. Good oral hygiene at home is essential to help keep periodontal disease from becoming more serious or recurring. You don't have to lose teeth to periodontal disease. Brush, clean between your teeth, eat a balanced diet, and schedule regular dental visits for a lifetime of healthy smiles.