Most people are unaware they have gum disease because it can exist without any symptoms. Gum disease can manifest itself in specific ways, including the following warning signs: Gums that are red, puffy, tender, or swollen Gums that bleed when brushing or flossing Receding gums (“gummy smile”) Dark red gums or purple-red patches at the gum line Chronic bad breath (halitosis) Loose teeth Sensitive teeth A bad taste in the mouth caused by pus oozing from gums Dental pain when chewing