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Persistent bad breath or bad taste in your mouth is usually a warning sign of gum disease. When bacteria build up on your teeth, they also irritate your gums. Your lingering bad breath might mean your gums are not healthy.
American Dental Association answeredOne of the warning signs of gum disease is persistent bad breath or a bad taste in the mouth. Periodontal disease is caused by plaque, the sticky, colorless film of bacteria that constantly forms on teeth. The bacteria create toxins that irritate the gums.