Severe periodontitis has the need for treatment. Clinical appearance of severe periodontitis need to actively seek medical examination and treatment, periodontitis will have a certain impact on the individual’s teeth, if the local irritation aggravated may lead to bleeding and swelling of the gums, and in severe cases may also produce gum recession and other symptoms. If not treated in time, the inflammation may spread to other parts of the body, premature tooth loss, and induce other diseases. Therefore, once the periodontitis needs to pay attention to, and actively treat. Clinically, after the emergence of severe periodontitis can be under the guidance of the doctor for periodontal sequence treatment, and the use of metronidazole, ornidazole and other medications, if there is a very deep periodontal pocket formation, it may require timely surgical treatment, and usually need to do a good job of dental health care.