What would be an indication you may have periodontal disease?

Gingival: Redness, inflammation, tenderness, bleeding on brushing and flossing, recession of tissue, root exposure, tooth mobility, halitosis, purulent discharge from gum line, gingival abscesses, pain, deep probing depths at the dentist, tooth loss. Best to have a full dental exam and soft tissue evaluation to determine the state state of your overall oral and gingival health.

Bleeding: If your gums bleed when brushing or flossing, that is the distinguishing factor for gingivitis. It may also be a sign that you have a more serious problem, that of periodontal or gum disease; and only your dentist can test for that by taking simple measurements around each tooth and appropriate x-rays.

Bad breath,red gums: Bad breath and red gums around the teeth can also indicate gum disease. Loose teeth in severe cases.