The dentogingival functional unit is composed of supracrestal fibrous connective tissue, epithelium and gingival sulcus union, whose width is 2.73 mm, which must be maintained for success of restorative procedures. Some clinical situations invade the biological space, causing alterations in the periodontium. In these cases, surgery is required to increase clinical crown in order to improve the anatomy and facilitate restorative procedures. Clinical studies however, have shown contradictory results on the modification of the position of the gingival margin during healing after a clinical crown lengthening. The objective of this study was to evaluate the changes in the position of the gingival margin after a clinical crown lengthening 3 and 6 months postoperatively. 28 different teeth from 9 patients who attended the Colombian Cooperative University Dental Clinics in Pasto subjected to clinical crown lengthening procedures, were evaluated. Results indicated a higher tendency for crown migration of the gingival margin as follows: 56.8% during the first month, 32.9% at the third month and 39.8% at six months. Six months after undergoing clinical crown lengthening procedures, a migration trend of the gingival margin was observed. During the first month of healing, the highest value of crown migration was present. This value decreased during the third and sixth months respectively. The stability of the gingival margin is achieved between the third and sixth months post surgically.