The inferior labial frenulum, alongside the superior labial frenulum, provides stability to the upper and lower lip.

[1] Absence of the inferior labial frenulum and/or the lingual frenulum is associated with the classical and hypermobility types of Ehlers-Danlos syndrome, but can also be absent in those without any underlying medical conditions.

[2] Tearing of the inferior labial frenulum may occur after being bit, especially after a fall, resulting in bleeding and pain.

Tearing of the inferior labial frenulum, as proven by various studies, can not be considered a sign of domestic abuse.

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