Contact hypersensitvity is a rare form of atypical gingival inflammation which is characterized by mild erythematous gingival involving the attached gingiva to atypical erythematous enlargement is characterized by massive infiltration of plasma cells into the subepithelial connective tissue. It is a rare condition; the cause of which is still not fully understood. It is often attributed to an allergic reaction to the components of chewing gums, dentifrices or various diet components. Two documented case of contact hypersensitivity who switched to an anti-tartar toothpaste on the advice of a dentist manifested from mild gingival erythema to gingival enlargement. The histological examination revealed infiltration of polyclonal plasma cells. The symptoms disappeared within two weeks of stopping the use of the dentifrice.