Tuberculous lesions of the oral cavity are rare and can be a diagnostic challenge, particularly in young immunocompetent patients. Most of the cases in the literature are secondary to pulmonary disease, whereas primary form is uncommon. This paper presents a case of gingival tuberculosis in a 26-year-old Indian female patient, manifesting as a rapidly extensive ulcer. The diagnosis was confirmed by histopathology and immunological investigations. Although oral manifestations of tuberculosis are rare, clinicians should include them in the differential diagnosis of various types of oral ulcers. An early diagnosis with a prompt treatment can prevent complications and potential contaminations.