Periodontal disease is the number-one cause of tooth loss in America. One hundred million Americans suffer from periodontal disease signs that may include bad breath, gingivitis, malocclusion, and tooth loss. Prompt treatment can control the severity of gum disease and save the teeth. Robert L. Mandell, D.M.D., M.M.Sc., is a board-certified periodontist who provides expert clinical and surgical periodontics for people of all ages from Lowell, Chelmsford, Dracut, Nashua and Tyngsborough, Massachusetts.