The main difference between gingivitis and periodontitis is that gingivitis does not invade the periodontal supporting tissues, and after perfect treatment, the periodontal tissues can be completely restored to normal, while periodontitis invades the periodontal supporting tissues, and the tissues cannot be restored to normal after treatment. 1. Gingivitis and periodontitis are both chronic infectious diseases caused by plaque biofilm, gingivitis does not violate the supporting tissues, there is no attachment loss and alveolar bone resorption, the formation of false periodontal pockets, after perfect treatment, periodontal tissues can return to normal. 2. Periodontitis has serious destruction of periodontal supportive tissues, loss of attachment, alveolar bone resorption, the formation of true periodontal pockets, if not treated in a timely manner, the lesions can continue to develop until the teeth are loose and fall off. After standardized treatment, periodontal inflammation can subside, but the damaged tissues are difficult to return to normal. It is recommended to go to the hospital in time for early professional treatment.