A lip tie is a tight or short band of tissue connecting a baby’s upper lip to the gum above the upper front teeth. Every baby has this tissue, called the maxillary labial frenulum, but when it’s unusually thick, short, or attached close to the gum line, it can restrict how far the upper lip moves. This restriction is what parents and some providers refer to as a “lip tie.” Whether it actually causes feeding problems is more controversial than many parents realize.
The Anatomy Behind a Lip Tie
The maxillary labial frenulum is a fold of mucous membrane that runs from the inside of the upper lip down to the ridge of gum in the center of the upper jaw. It’s made of dense connective tissue with some muscle fibers woven in from the circular muscle of the lip. There are no major blood vessels inside it, which is one reason procedures to release it tend to involve very little bleeding.
This tissue is a leftover from structures that form during embryonic development. In most babies, it thins out and recedes on its own as the child grows, the jaw expands, and the permanent teeth come in. In some babies, the frenulum is shorter than typical or attaches low on the gum, close to where the teeth will emerge. This low attachment is what providers look for when evaluating whether the lip can move freely enough for feeding.
What Parents Notice
The most common reason parents look into lip ties is difficulty with breastfeeding. For a baby to latch well, the upper lip needs to flange outward, creating a seal around the areola rather than just the nipple. When the frenulum holds the lip too tightly, the baby may not be able to flare the lip enough, which can lead to a shallow latch.
Signs parents and lactation consultants often point to include:
- A visibly tight upper lip that doesn’t flip outward during feeding
- Clicking sounds while nursing, caused by the baby repeatedly breaking and re-establishing suction
- Short or painful feedings for the mother, often with nipple damage, because the baby compensates for a poor seal by clamping down
- Gassiness or excessive spit-up from swallowing air through an incomplete seal
- Sliding off the breast frequently because suction can’t be maintained
These symptoms overlap with many other breastfeeding challenges, from positioning issues to tongue tie to normal newborn learning curves. That overlap is part of why lip tie diagnosis remains so debated.
How It’s Evaluated
There is no single, universally accepted test for lip tie. A provider typically lifts the baby’s upper lip to see how far it moves and where the frenulum attaches to the gum. If the tissue is so tight that the lip blanches white and can’t flange outward, that’s generally considered restrictive.
Several grading systems exist. The most widely referenced one classifies lip ties by how far down the gum the attachment reaches, from a minor attachment high on the gum to a thick band that extends over the ridge where teeth will come in. A newer system adds two more measurements: how far the frenulum stretches when pulled and the ratio of free lip movement to total lip length. No grading system, however, has been shown to reliably predict which babies will actually have feeding problems.
The Medical Debate
This is where the topic gets complicated for parents searching for answers. A 2024 clinical report from the American Academy of Pediatrics stated plainly that labial frenula are normal oral structures present in all infants, that the relationship between the upper lip frenulum and breastfeeding problems is unclear, and that lip ties may be overdiagnosed in some areas. The AAP concluded that labial frenula are “unrelated to breastfeeding mechanics and do not require surgical intervention to improve breastfeeding.”
Research backs this up in specific ways. A study evaluating the anatomy of the upper lip frenulum found no correlation between the grade of lip tie and breastfeeding comfort scores, pain scores, or latch quality. No randomized controlled trials have been conducted to evaluate whether releasing the upper lip frenulum actually improves breastfeeding outcomes. That’s a significant gap, because it means the procedures being performed on babies are based on clinical judgment and parent reports rather than controlled evidence.
On the other side, many lactation consultants and some pediatric dentists report seeing immediate improvements in latch after a lip tie release. Parents frequently describe dramatic changes. Whether those improvements come from the procedure itself, from the concurrent lactation support that usually accompanies it, or from normal developmental changes in the baby’s feeding ability is genuinely unclear.
Effects Beyond Feeding
A prominent frenulum that persists into toddlerhood can create a gap, called a diastema, between the two upper front teeth. In many children this gap closes on its own when the permanent teeth come in. A thick frenulum can also trap food between the lip and the front teeth, which, combined with other risk factors, may raise the chance of cavities in those teeth. Pediatric dentists sometimes recommend releasing the frenulum later in childhood specifically to address a persistent gap or hygiene concerns, which is a separate decision from the infant breastfeeding question.
What the Procedure Involves
When a provider does recommend releasing a lip tie, the procedure is called a frenectomy. It takes just a few minutes and can be done with surgical scissors, a scalpel, or a dental laser. The baby is typically awake, sometimes with a topical numbing agent applied to the area. Bleeding is minimal in most cases and stops with light pressure from gauze.
Studies comparing laser and blade techniques have found no significant difference in healing quality at two weeks. One finding worth noting: when a laser is used, applying more energy during the procedure was associated with slower healing at the 14-day mark. Both methods heal without stitches, as the small wound closes on its own.
Some providers instruct parents to perform stretching exercises on the wound site several times a day for weeks afterward to prevent the tissue from reattaching. This is one of the more stressful parts of the process for families, as it involves lifting the baby’s lip and rubbing the healing wound. There is no standardized protocol for these stretches, and no strong evidence that they improve outcomes. The frequency, technique, and duration recommended vary widely from provider to provider.
Sorting Through the Decision
If you’re a parent trying to figure out whether your baby’s feeding problems are caused by a lip tie, the most useful first step is working with a lactation consultant who can evaluate the full picture: your baby’s latch, positioning, tongue movement, and overall feeding pattern. Many of the symptoms attributed to lip ties improve with skilled breastfeeding support alone.
If a provider recommends a frenectomy, it’s reasonable to ask what specific functional problem they’re seeing, whether they’ve ruled out other causes of feeding difficulty, and what evidence supports the procedure for your baby’s situation. A tight-looking frenulum that isn’t causing a measurable problem may not need treatment, especially given that many frenula thin and recede naturally as a child’s mouth grows. The gap between how commonly lip tie releases are performed and how little controlled evidence supports them is something worth understanding before making a decision.