A tongue tie is a condition where a small band of tissue under the tongue is unusually short, tight, or thick, restricting how far the tongue can move. This tissue, called the lingual frenulum, connects the underside of the tongue to the floor of the mouth. Everyone has a frenulum, but when it’s tight enough to limit tongue function, it’s considered a tongue tie. The medical term is ankyloglossia, and it affects roughly 4% to 10% of newborns.
How the Frenulum Restricts the Tongue
The lingual frenulum is a thin strip of tissue that sits in the midline under the tongue. In most people, it allows the tongue to move freely: reaching the roof of the mouth, sweeping side to side, and extending past the lower lip. When this tissue is too short or attaches too close to the tongue tip, it acts like an anchor, holding the tongue down and limiting its range of motion.
There are two broad types. An anterior tongue tie is the more obvious kind, where the frenulum attaches at or near the tip of the tongue. This often creates a visible heart-shaped appearance when a baby tries to stick out their tongue. A posterior tongue tie is harder to spot because the frenulum attaches further back on the underside of the tongue, but it can still restrict movement in meaningful ways. Posterior ties are more controversial among clinicians, and medical panels have not reached consensus on when they require treatment.
Signs in Breastfeeding Infants
The most well-documented effect of tongue tie is difficulty breastfeeding. About 55% of infants with a tongue tie have trouble with feeding, compared to 42% of infants without one. That gap is real but worth noting: not every baby with a tongue tie will struggle, and many breastfeeding problems have nothing to do with the frenulum at all.
When a tongue tie does interfere with feeding, the core problem is that the baby can’t move their tongue well enough to create an effective latch. A good latch requires the tongue to extend over the lower gum and cup the breast, drawing milk out efficiently. A restricted tongue makes this harder, leading to a shallow latch, poor milk transfer, and long or frustrating feeds. Babies may slip off the breast frequently, make clicking sounds while nursing, or seem hungry even after extended feeding sessions.
For the mother, the most common complaint is nipple pain. A shallow latch concentrates pressure on the nipple rather than distributing it across the areola, which can cause cracking, blistering, and soreness that doesn’t improve with positioning adjustments. Some practitioners have attributed reflux, colic, and poor weight gain to tongue tie as well, though breastfeeding difficulty is the only symptom with consistent supporting data.
Does Tongue Tie Affect Speech?
Many parents worry that a tongue tie will cause speech problems, and this is one of the most common reasons older children get referred for evaluation. The reality is more nuanced than most people expect. A study of 25 children (average age 3.7 years) referred for speech concerns thought to be caused by tongue tie found that nearly 88% of their speech errors were actually age-appropriate, the kind of mispronunciations that are normal for toddlers and preschoolers still developing language. Only 28% had errors specifically involving sounds that require the tongue to touch the ridge behind the upper teeth, the type of articulation that a restricted frenulum would logically affect.
That same study found no measurable improvement in speech clarity after surgical release of the tongue tie. This doesn’t mean tongue tie never affects speech, but it does suggest that many children referred for tongue tie release due to speech concerns may have been developing normally all along. Sounds like “l,” “r,” “t,” “d,” “n,” and “th” require the tongue to reach the upper palate or the back of the front teeth, and a significantly restricted frenulum could theoretically make these harder. But in practice, children are remarkably good at compensating.
Effects on Jaw and Dental Development
A restricted tongue doesn’t just affect feeding and speech. Over time, limited tongue mobility may influence how the jaw and teeth develop, particularly in growing children. The tongue naturally rests against the roof of the mouth and exerts outward pressure that helps the upper jaw widen as a child grows. When the tongue can’t reach the palate, this pressure is absent.
Research has found that tongue tie is associated with narrower upper and lower dental arches, meaning less space between the canines and molars. It may also contribute to crowding of the lower front teeth, a narrower or more steeply sloped palate, and a type of bite misalignment where the lower jaw protrudes slightly forward. More severe tongue ties appear to increasingly restrict upper jaw growth while allowing the lower jaw to develop more prominently. There’s also a possible connection between tongue tie and the position of a small bone in the throat that affects airway openness, though the evidence for airway-related problems remains very limited.
It’s important to keep these findings in perspective. Most of this evidence comes from small studies, often without control groups, and the strength of evidence is considered low. A tongue tie is likely one contributing factor among many in dental and jaw development, not a sole cause.
How It’s Diagnosed
Diagnosis is surprisingly inconsistent, which is part of why tongue tie generates so much debate. There is no single universally accepted test. Clinicians use several different tools, each with its own criteria.
The most detailed is the Hazelbaker Assessment Tool, which scores both how the frenulum looks and how well the tongue functions, on a scale up to 24 points. A function score below 11 out of 14, or an appearance score below 8 out of 10, suggests a tongue tie. Other systems classify tongue ties by where the frenulum attaches relative to the tongue tip: attachments within a few millimeters of the tip are considered more severe, while those closer to the base are milder on some scales and more severe on others, depending on which classification is used. This inconsistency means that a baby diagnosed with a tongue tie by one provider might be considered normal by another.
Treatment Options
The simplest procedure is a frenotomy, where a clinician snips the frenulum with sterile scissors. For young infants, this is often done in an office visit without general anesthesia. The frenulum is thin and has few nerve endings or blood vessels in newborns, so the procedure is quick and bleeding is minimal. A gauze pad pressed to the area is typically enough to stop any bleeding.
A more involved option is a frenulectomy, which removes the frenulum tissue entirely rather than just cutting it. This is more predictable and has a lower chance of the tissue reattaching, but it’s also more invasive and may require general anesthesia, especially in older children. Frenulectomy is generally recommended when the frenulum is thick or fibrous, when a previous release has grown back, or in the most severe type of tongue tie where the frenulum attaches right at the tongue tip.
After either procedure, parents are usually instructed to gently stretch or massage the area under the tongue during healing to prevent the wound edges from fusing back together.
The Overdiagnosis Debate
Over the past decade, the number of children diagnosed and treated for tongue tie has risen dramatically in wealthier countries. This trend has prompted concern from some medical specialists that tongue tie is being overdiagnosed. A clinical consensus statement from a panel of ear, nose, and throat surgeons acknowledged that in some communities, infants are being overdiagnosed with the condition, and that the benefits of surgical intervention remain unclear due to a lack of high-quality randomized trials.
Part of the problem is that breastfeeding difficulties are extremely common and have many possible causes, from positioning issues to milk supply to infant anatomy beyond the frenulum. When a tongue tie is present alongside feeding problems, it’s tempting to assume one is causing the other. In one study, 82% of infants with untreated tongue tie were still breastfeeding at two months, suggesting that many resolve their feeding difficulties without surgery. The decision to treat is worth careful consideration, ideally with input from a lactation consultant who can evaluate the full picture before jumping to a procedure.