Periodontal disease refers to diseases that occur in dental support tissues, mainly including gingivitis and periodontitis. Periodontal disease is a chronic progressive disease. The early symptoms of the lesion are not obvious, and sometimes it only manifests as brushing bleeding. Most patients do not agree. The main symptoms of periodontal disease are brushing bleeding, red gums, gingival recession, loose teeth and displacement. Among these symptoms, brushing bleeding, gingival redness and swelling are early lesions of periodontal disease.