Résumé -Objectif :Répertorier les caractéristiques épidémiologiques, étiopathogéniques, cliniques, histologiques et thérapeutiques de la sialométaplasie nécrosante (SMN). Results: NSM is an uncommon benign disease of salivary glands. Usually, NSM affects the minor salivary glands of the hard palate. It occurs primarily in adults, NSM is manifested by a sharply demarcated crater-like palatal ulcer. Although the etiology is uncertain, the lesion heals spontaneously. Conclusion: Dental surgeon has to know this lesion because of the risk of histological and clinical confusion with malignant lesions which may lead to mutilating radical treatment.