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. A lack of thick attached gum tissue, in conjunction with a high (closer to the tooth) frenum attachment, exaggerates the pull on the gum margin and can result in a 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. This procedure is very simple and requires minimal recovery.

When Orthodontic treatment is planned or initiated, the removal of an abnormal frenum, with or without a gum graft, can increase stability and prevent the opening of spaces between the teeth after the braces are removed.