Gingivitis is a bacterial infection that causes gum inflammation. If left untreated, it can progress to periodontitis, a more severe form of gum infection. Gingivitis is a mild form of gum disease. It causes inflammation of the gums, but it does not usually result in symptoms. It’s possible to have gingivitis and be completely unaware of it. It usually causes minor problems that come and go. The disorder is reversible through proper oral hygiene and professional dental care. Periodontitis, or severe gum disease, is the more advanced stage of gum disease and leads to the progressive destruction of teeth’ supporting structures. It can cause gum damage and tooth loss. Periodontitis is an inflammation of the periodontium, the gum tissue and bone that anchors your teeth. This medical condition can cause teeth to loosen as it advances.