A frenum is a naturally occurring muscle attachment, normally seen between the front teeth .
It connects the inner aspect of the lip with the gum. A lack of attached gingiva, in conjunction with a high (closer to the biting surface) frenum attachment, which exaggerates the pull on the gum margin, can result in recession. Additionally, an excessively large frenum can prevent the teeth from coming together resulting in a gap between the front teeth. If pulling is seen or the frenum is too large to allow the teeth to come together, the frenum is surgically released from the gum with a Frenectomy. Often a Gingival Graft is added to re-establish an adequate amount of attached gingiva.
When Orthodontic treatment (see Gingival Grafting and Orthodontics) 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.