Checking for a tongue tie starts with looking at how the tongue moves, not just how it looks. A tongue tie occurs when the thin strip of tissue connecting the underside of the tongue to the floor of the mouth is unusually short, thick, or tight, limiting the tongue’s range of motion. Some ties are obvious at a glance, but others, particularly posterior ties hidden beneath the tissue, require hands-on assessment by a trained professional.
What to Look for Visually
The most recognizable sign is a heart-shaped or notched tongue tip when the tongue is extended. If you gently lift a baby’s tongue or ask an older child or adult to stick their tongue out, the frenulum (that small band of tissue underneath) may pull the tip downward and create that distinctive notch. In some cases the frenulum attaches right at the tongue tip rather than further back, making the restriction easy to spot.
Not all tongue ties look dramatic, though. A tight frenulum can be short, thick, or have very little stretch to it without creating an obviously heart-shaped tip. The attachment point matters too: ties that connect closer to the tip of the tongue and closer to the top of the lower gum ridge tend to cause more restriction than those attached further back and lower on the floor of the mouth.
Simple Movements to Test at Home
Visual appearance alone doesn’t tell the full story. What the tongue can actually do matters more. There are several movements you can check informally, whether you’re evaluating a baby, a child, or yourself.
- Lift: Can the tongue reach up to touch the roof of the mouth with the jaw open wide? Try touching the spot just behind your upper front teeth. If the tongue can’t get there without the jaw closing to compensate, that suggests restriction.
- Extension: Can the tongue stick out past the lower lip? A tied tongue often can’t extend beyond the lower gum line, or it humps up in the middle instead of pointing forward.
- Side-to-side movement: Can the tongue sweep left and right without the jaw shifting? In someone without restriction, the tongue moves independently. If the whole jaw has to shift to get the tongue to one side, the frenulum may be limiting lateral movement.
- Cupping: Can the tongue form a bowl shape with the edges curled up? This motion is essential for moving food and liquid around the mouth.
For babies, you obviously can’t give verbal instructions. Instead, observe what happens during crying (the tongue should lift visibly), and try running a clean finger along the underside of the tongue to feel whether a tight band restricts movement.
Signs in Breastfeeding Babies
Many parents first suspect a tongue tie because of breastfeeding problems. The two main red flags, according to the American Academy of Pediatrics’ 2024 clinical report, are an ineffective latch and poor weight gain. But the signs can be more nuanced than that.
On the baby’s side, watch for a “chompy” or chewing-type suck, sometimes with dimpled cheeks. Clicking sounds during feeding suggest the tongue is losing suction. Some babies with ties nurse constantly, cluster-feeding every day rather than occasionally, yet never seem full. Others are unusually sleepy and hard to wake for feeds. Slow weight gain or failure to thrive is the most serious concern.
The nursing parent’s experience is equally telling. Nipple pain that persists through the entire feeding and doesn’t improve with better positioning is a hallmark. Cracked or bleeding nipples despite working with a lactation consultant, a nipple that comes out of the baby’s mouth flattened or shaped like a lipstick tube, and a sandpapery or rubbing sensation during nursing all point toward a latch problem that could involve a tongue tie. Repeated bouts of mastitis or nipple vasospasm (where the nipple blanches white from restricted blood flow) can also be related.
That said, the AAP emphasizes that most breastfeeding difficulties, including pain, are not caused by tongue ties. A lactation consultant should evaluate latch, positioning, and milk supply before assuming the frenulum is the problem.
Signs in Older Children and Adults
Tongue ties don’t disappear with age, and people who were never diagnosed as infants can carry functional limitations into adulthood. The symptoms shift from feeding-related to speech, dental, and quality-of-life issues.
Speech is the most common concern. Sounds that require the tongue to press against the roof of the mouth or the back of the teeth become difficult. The sounds most often affected are “t,” “d,” “z,” “s,” “th,” “r,” and “l.” Some people compensate well enough that they don’t notice a problem until they try to speak quickly or clearly in a professional setting.
Dental health can suffer too. A restricted tongue can’t sweep food debris off the teeth or fully clear the mouth during swallowing, raising the risk of tooth decay and gum inflammation. Over time, the tongue may push forward against the lower front teeth (a habit called tongue-thrust), creating gaps or misalignment. That altered swallowing pattern can also strain the jaw joints near the ears, contributing to TMJ pain. There’s even a connection to sleep apnea: years of tongue restriction can contribute to a narrower palate and smaller upper airway, increasing the risk of airway collapse during sleep.
How Professionals Assess Tongue Ties
A home check can raise suspicion, but a proper diagnosis requires a trained provider who can physically examine the frenulum and assess function. Pediatricians, lactation consultants, pediatric dentists, ENT specialists, and speech-language pathologists all play roles depending on the patient’s age and symptoms.
For newborns, one widely used tool is the Hazelbaker Assessment Tool for Lingual Frenulum Function. It scores both appearance (tongue shape, frenulum length and elasticity, attachment points) and function (lateralization, lift, extension, cupping, and the wave-like motion the tongue makes during sucking). Each item is scored 0 to 2, with a perfect function score of 14. Scores below 11 indicate impaired function, and surgical release is considered when nonsurgical approaches haven’t helped.
The Bristol Tongue Assessment Tool is a simpler alternative used in many hospital settings. It evaluates four things: tongue tip appearance, where the frenulum attaches to the lower gum ridge, how well the tongue lifts when the mouth is wide open (typically observed during crying), and how far the tongue extends. A score of 0 to 3 out of 8 suggests significant restriction.
For older children and adults, a speech-language pathologist may use a dynamic assessment: asking you to place your tongue tip on the “spot” just behind your upper front teeth and hold it there, sweep along the gum line behind your back molars, or circle the tongue around your lips. These tasks reveal whether restriction is causing real functional limitations or whether the frenulum, while visible, isn’t actually causing problems.
Posterior Ties Are Harder to Spot
Not every tongue tie sits at the front of the mouth in plain view. Posterior tongue ties involve a frenulum that attaches further back, closer to the base of the tongue. These ties can be partially or fully hidden beneath the mucous membrane lining the floor of the mouth, making them invisible on a quick look. They’re sometimes called submucosal ties.
A posterior tie can restrict tongue movement just as much as an obvious anterior one, but it’s more likely to be missed. The tongue tip may look normal and even extend past the lower lip, yet the back of the tongue can’t lift properly to create the suction and wave-like motion needed for efficient feeding or clear speech. This is why a physical, hands-on exam (feeling under the tongue, not just looking) is essential for a complete evaluation.
What Happens After Diagnosis
If a tongue tie is confirmed and causing functional problems, the first step is usually nonsurgical. For breastfeeding issues, that means working with a lactation consultant to optimize latch and positioning, and sometimes with a bodyworker or occupational therapist to address any tension patterns in the baby.
When those approaches aren’t enough, a frenotomy (a quick procedure to release the frenulum) may be recommended. For infants, the tissue is thin and the procedure is brief, often done in an office setting. The AAP’s 2024 guidance stresses that surgery should be reserved for cases where significant functional impairment persists after nonsurgical options have been tried. There is no evidence that laser release is more effective than other methods, and the AAP specifically recommends against post-procedure wound stretching exercises, where parents repeatedly reopen the wound site to prevent reattachment.
For older children and adults, the tissue is thicker and the procedure may involve local anesthesia. Speech therapy is often recommended afterward to retrain tongue movement patterns that may have been compensated for over years.