A frenum is a naturally occurring muscle attachment, normally seen between the front teeth (either upper or lower). It connects the inner aspect of the lip with the gum. An improperly developed frenum attachment can pull on the gum margin and cause recession. Additionally, an excessively large frenum lead to gaps between the front teeth.
When Orthodontic treatment is planned or initiated, the removal of an abnormal frenum, with or without a gingival graft, can increase stability and improve success of the final orthodontic result.
A frenectomy is a minor surgery to remove an improper frenum attachment. It is a very quick procedure and only requires local anesthesia.