Oral staining can be secondary to intrinsic or extrinsic environmental factors [1]. Extrinsic is recognized mostly on dental surfaces and commonly associated with the use of chlorhexidine mouthwash [2,3,4], certain toothpastes [5], frequent intakes tea and/or coffee [6,7]. When discoloration appears a mucosal surface, clinician should careful take thorough history build differential diagnosis b...