If severe gum disease or periodontitis cannot be controlled by antibiotics and root planing, then you might need Flap Surgery. Gingival flap surgery is used to treat periodontitis. It may be recommended for people with moderate or advanced periodontitis. The procedure is performed under local anaesthetic. The doctor will pull back a section of your gums to clean the roots of your teeth and repair damaged bone, if needed. The gum flap is sewn back into place and covered with gauze to stop the bleeding. Typically it takes only a few days to recover from the procedure. Your doctor may ask you to follow some care instructions at home, and may prescribe medications to prevent infection and manage any pain.