Periodontitis is a serious condition that develops if gingivitis is not treated promptly. Mild periodontitis can be cured. If periodontitis is detected early, it can be controlled by dental cleaning, removing dental plaque, food residues, tartar, or soft deposits around the teeth, and then rinsing and medicating the gum tissue. If periodontitis further progresses to cause partial absorption of the alveolar bone, this stage can also be treated by guided bone regeneration to cure periodontitis. If severe, with extensive absorption of the alveolar bone and significant loosening of the teeth, it is very difficult to cure.