Acute Necrotizing Ulcerative Gingivitis (ANUG) is described as “a rapidly destructive, non-communicable, gingival infection of complex etiology”. It is characterized by necrosis of the crest of the gingival papillae, spontaneous bleeding, pain and halitosis. If left untreated, it may spread laterally and apically to involve the entire gingival complex, including the mucosa and alveolar bone, leading to necrotizing ulcerative periodontitis to necrotizing ulcerative stomatitis and finally Noma. There are various predisposing factors like poor oral hygiene, stress, smoking, hormonal imbalance, nutritional deficiencies etc. This case report presents the conservative management of ANUG in patient and probable mechanism of pathogenesis of predisposing factors involved.