The replacement of missing attached gum is called gingival or gum grafting. A small piece of attached gingiva is taken from the roof of the mouth, just adjacent to the back teeth, and transplanted to the site in question. The new tissue reattaches and reforms a new layer of attached gum, which should last a lifetime with proper care. Exposed tooth roots are the result of gum recession. Perhaps you wish to enhance your smile by covering one or more of these roots that make your teeth appear too long. Or, perhaps the appearance of these areas is not a problem but because exposed roots are sensitive to hot or cold foods and liquids there is a lot of discomfort closing the exposed areas will result in less sensitivity.