A frenulum is a small fold of tissue that anchors one moving part of your body to another, limiting its range of motion. You have frenula (the plural form) in several places: your mouth, your genitals, your digestive tract, and even your brain. The ones most people notice are under the tongue, inside the upper lip, and on the genitals.
Where Frenula Are Located
The most prominent frenula are in your mouth. The lingual frenulum is the thin band connecting the underside of your tongue to the floor of your mouth. Lift your tongue and you can see it. The labial frenulum connects your lips to your gums, and the most obvious one sits just above your two upper front teeth. You also have a matching one below your lower front teeth and smaller frenula running along both sides of your cheeks toward the back of your mouth.
On the penis, a frenulum connects the foreskin to the underside of the head (glans). In people with a vulva, a frenulum sits where the inner lips meet near the clitoris. These genital frenula are packed with nerve endings and play a significant role in sexual sensation.
What Frenula Are Made Of
Frenula are more complex than they look. The lingual frenulum, for example, is a dynamic fold made of the floor-of-mouth fascia covered by a layer of mucosa. Under a microscope, it contains mostly type I collagen fibers for structure, type III collagen near the surface and around blood vessels, and layers of elastin that allow it to stretch. Some specimens also contain skeletal muscle fibers. Nerve branches from the lingual nerve sit just beneath the surface on the underside of the tongue, which is why the area is so sensitive.
What Frenula Do
In the mouth, frenula stabilize the tongue and lips. The lingual frenulum keeps your tongue anchored while still allowing the range of motion needed for speaking, chewing, and swallowing. In infants, proper tongue movement is essential for breastfeeding. Lip frenula help keep your lips positioned against your gums.
The penile frenulum serves a different purpose entirely. It is one of the most densely innervated areas of the penis, with overlapping nerve branches and high concentrations of specialized sensory receptors. Researchers have long recognized it as a central area for sexual sensation, generating intensely pleasurable responses to stimulation.
Tongue-Tie and Lip-Tie
When a lingual frenulum is unusually short, thick, or tight, it restricts tongue movement. This condition is called ankyloglossia, commonly known as tongue-tie, and it affects an estimated 4% to 16% of infants. In newborns, it can make breastfeeding painful or ineffective because the baby cannot latch properly or move their tongue enough to transfer milk.
Clinicians assess severity by measuring the “free tongue” length, meaning how far the tongue can extend. A normal measurement is greater than 16 millimeters. Mild restriction falls between 12 and 16 mm, moderate between 8 and 11 mm, severe between 3 and 7 mm, and complete tongue-tie is less than 3 mm. In older children and adults, a tight lingual frenulum can affect speech, particularly sounds that require the tongue to reach the roof of the mouth.
A tight upper lip frenulum can also cause problems. Two specific subtypes, where the tissue extends into or through the gum ridge between the front teeth, are associated with a persistent gap between the upper front teeth called a midline diastema.
Frenulum Surgery
The most common surgical fix is a frenotomy (also called a frenectomy, both terms refer to the same procedure). For infants with tongue-tie, a trained clinician makes a small cut in the lingual frenulum, usually with scissors, to free the tongue’s movement. It is considered the gold standard treatment when tongue-tie is causing latching pain, difficulty latching, or poor milk transfer.
For infants, the procedure is quick and typically done in a clinical office. Recovery follows a general pattern: the first one to three days tend to be the sorest, with fussiness and a white healing patch forming at the site. Soreness tapers off around days seven to ten. Feeding improvements are usually gradual, taking two to four weeks. During recovery, parents are often instructed to perform gentle stretching exercises several times a day to prevent the tissue from reattaching as it heals. Bottle feeding can resume immediately, but breastfeeding may take some relearning with support from a lactation consultant.
In adults, frenulum surgery may be recommended for a tight lip frenulum contributing to a tooth gap, or for a lingual frenulum restricting speech. A frenuloplasty, which reshapes the tissue rather than simply cutting it, is sometimes used in these cases for more precise results.
Frenulum Tears
Frenula can tear from sudden force or friction. A torn lingual frenulum sometimes happens from a fall or impact to the mouth. The penile frenulum can tear during vigorous sexual activity, which tends to bleed noticeably because of the area’s rich blood supply. Most minor frenulum tears heal on their own with basic wound care, but tears that bleed heavily, keep reopening, or cause lasting pain are worth getting evaluated. Repeated tearing of the penile frenulum is a recognized issue that sometimes leads to elective surgery to release the tissue permanently.