Gingival recession is a clinical problem that dental professionals face on a daily basis

When the gum has receded beyond the crown, and the root is showing, it is often desirable to re-cover the root surface. This is primarily done for cosmetics, but also if there is root sensitivity. There may also be a lack of attached (hard) gum tissue, and the root coverage surgery is designed to correct that problem at the same time.

Root Coverage

When there is inadequate hard gum and root coverage is desired, a connective tissue graft is commonly done. This procedure is similar to the coronally positioned flap, except that a graft of connective tissue is sutured over the root before the flap is advanced.

The flap covers most or all of the graft, and provides blood supply to it. If a graft were just placed over the root without advancing a flap, there would be no blood from the root surface and the graft would die. The flap that covers the graft is able to provide the needed blood supply.