Periodontitis is an inflammation of the soft and bone tissues of the supporting apparatus of the tooth. When periodontitis occurs, not only the gums are affected, but also the bone tissue of the alveolar process of the jaw. The ligamentous apparatus of the tooth, which holds it in the hole, is destroyed. Loose dental arch appears. Periodontitis is an insidious and common dental disease. It develops gradually and at the initial stage does not cause sharp discomfort, so many people do not immediately go to the dentist. In order to notice the disease in time and seek help, you need to clearly know what periodontitis is and how it manifests itself.