Labial Frenulum: Definition, Function & Importance

The labial frenulum (frenulum labii superioris) is a midline fold of mucosa and connective tissue attaching the upper lip to the maxillary gingiva between the central incisors.

Functions

• Limits superior excursion of the upper lip.
• Stabilizes the lip during sucking, speech, and facial expression.
• May help prevent food trapping in the vestibule.

Clinical Significance

• High attachment / thick frenulum – can cause midline diastema (gap between central incisors), impede oral hygiene, interfere with denture fit, or restrict lip movement (affecting speech/orthodontics).
• Frenectomy/frenuloplasty – simple surgical release; often done with orthodontic treatment or for denture preparation.
• Trauma – common in toddler falls; bleeds profusely but usually heals well.