Un frenillo es un accesorio del músculo que ocurre naturalmente, normalmente se ve entre los dientes frontales (ya sea superior o inferior). 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. Además, 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. A frenectomy is simply the surgical removal of a frenum.
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.