The importance of an adequate amount of keratinized and attached gingiva to maintain gingival health has been stressed by several authors (Friedman & Levine 1964, Lang & Löe 1972, Bernimoulin & Mühlemann 1973) and though the rationale for increasing the width of the gingiva applies equally well to both the lingual and the vestibular surfaces, only one report of a graft on the lingual aspect of the mandible in dentate patients has been found in the literature (Goldman & Cohen 1973). The object of this report is to describe the indications, the surgical procedure devised and the results obtained in two patients.