The main symptoms of periodontitis are red and swollen gums, loose texture, bleeding on probing, pus overflow from periodontal pockets and loose teeth. 1. Periodontitis is a chronic inflammatory disease caused by bacteria in plaque that invade the periodontal tissues. 2. Symptoms of periodontitis are, in the early stage, red and swollen gums, soft texture, bleeding from probing, and with the continuous development of the disease there will be loosening of the teeth, widening of the gaps between the teeth, receding gums until the final loss of teeth. In addition, patients with periodontitis may also be accompanied by symptoms such as periodontal abscess, root surface caries, and bad breath. If the gums are red and swollen and other symptoms, it is recommended that patients actively seek medical treatment, general periodontitis early prognosis is good, the prognosis of the middle is better, to the late prognosis of the effect will be worse, so it is necessary to treat as soon as possible.