Periodontal disease that is not unusual.

Periodontal disease is a gum disease that is not unusual. Thus the National Institute of Dental and Craniofacial Research (NIDCR acronym in English) indicates that 80 percent of Americans have some form of gum disease or periodontal disease. The problem begins with the plate. (See also Oral Hygiene.) Plaque that is not removed can harden and form bacteria that turns into tartar. Once this happens, the brush is not enough. Only a professional cleaning by a dentist can remove tartar.