Gum odor is mostly seen in people with poor oral hygiene, patients can have different degrees of gingivitis or periodontitis, the common causative factors of both diseases are plaque, soft tartar and tartar. Bacteria in the oral cavity can colonize the neck of the teeth to form plaque, plaque to soft tartar as nutrition gradually grow, if not cleaned in time will mineralize into hard tartar around the neck of the teeth, located in the gingival or subgingival, long-term release of toxins, cellular metabolites, etc. damage periodontal tissue and produce odor. Gum odor can also be seen in patients with acute necrotizing ulcerative gingivitis, this type of disease with Clostridium difficile and spirochetes as the causative agent, in the last century war years, also known as trench stomatitis, nowadays rare, the disease occurs in young adults with poor oral hygiene, the onset is urgent, often with extensive necrosis of the gums, producing a corrupt odor as a typical feature, clinically the disease is self-limiting, so the gums have a bad smell You should go to a professional dental hospital in time to discover the cause of the disease and treat it early to avoid further deterioration.