Moderate to severe periodontitis can still be treated in general. 1. moderate and severe periodontitis is not a very difficult disease to treat, periodontitis is mainly due to the inflammation of the soft tissues of the teeth and the symptoms, if the periodontitis is not treated in time may lead to the aggravation of the symptoms of periodontitis, the development of moderate and severe periodontitis, the gums red, swollen, bleeding gums and other conditions, and in severe cases, may also produce recession of the gums. 2. After the emergence of moderate to severe periodontitis, you need to carry out systematic periodontal treatment under the guidance of the doctor, including scaling, scraping and root planing, etc., and you can also use metronidazole buccal tablets, ibuprofen and other medications to treat the disease. During the period of treatment, you need to see your doctor regularly for review, protect your teeth to avoid dental damage, and use medication as prescribed by your doctor.