Periodontal disease, also known as gum disease, is an oral condition that affects the gums and supporting structures in your mouth. It begins as a bacterial infection of the gums and gradually progresses until it destroys your gums and bone structure. The milder stage of periodontal disease is known as gingivitis, while the more severe form of the disease is known as periodontitis. You should be checked for periodontal disease each time you visit our dentists.