This is infection caused in the mouth or oral cavity. Infection may be bacterial, fungal or viral. The outcome of the infection can be mouth ulcers, tongue ulcers, mouth pain, tingling mouth, dental disorders, Gingivitis, throat infection or tongue pain. Various tests for diagnosis of the infection are swab culture of the ulcer, mucosal biopsy, blood test and physical examination. This type of infection is generally caused by eating or swallowing any infectious food. Often due to deficiency of vitamin B, ulcer can be seen around our mouth. They are different from oral infections. In case of any symptoms of oral infection, you must see a doctor.