The lingual frenulum is the tissue that connects the tongue to the floor of the mouth, and it plays a crucial role in such fundamental functions as speaking, chewing, and swallowing. Although it generally goes unnoticed, any abnormality in its structure or mobility can have significant consequences for oral development and overall health. From breastfeeding difficulties in newborns to speech problems or dental malocclusion in adults, lingual frenulum abnormalities are an area that requires early professional attention to prevent long-term complications.

For decades, dentistry has studied these variations, which are clinically known as ankyloglossia and present with varying degrees of severity. Diagnosis is not always straightforward, and the condition is often mistaken for habits or delays in speech development. A careful evaluation, which includes clinical examination and, in some cases, functional assessments of the tongue, helps determine whether intervention is necessary.

How are lingual frenulum abnormalities diagnosed?

Ankyloglossia is diagnosed through a detailed clinical evaluation and, in some cases, functional tests of the tongue. The main steps include:

• Visual examination: The professional examines the length and shape of the lingual frenulum, noting whether it restricts the tongue’s movement upward, forward, or sideways. The goal is to identify signs such as a short, thick frenulum or one that is attached close to the tip of the tongue.
• Functional assessment: This evaluates how tongue mobility affects basic functions such as sucking, swallowing, chewing, and speech. In infants, the ability to latch onto the nipple or pacifier is observed; in older children and adults, speech and the articulation of certain sounds are assessed.
• Scales and clinical criteria: There are standardized tools, such as the Hazelbaker scale, that assess both the appearance and function of the tongue to determine the severity of ankyloglossia and the need for intervention.
• Multidisciplinary evaluation: In some cases, speech-language pathologists or pediatricians work together to assess the functional impact on feeding or language and determine the most appropriate treatment plan.

Causes

The abnormalities of the lingual frenulum are mainly caused by congenital, that is, present from birth, which affect the development of connective tissue and the attachment of the frenulum. These variations may result from genetic factors that determine the length, thickness, and elasticity of the frenulum, as well as from abnormalities in the embryonic development of the tongue and oral cavity. Although less common, they can also arise from trauma or scarring that limit tongue mobility throughout life, affecting basic functions such as breastfeeding, speech, and swallowing.

Main causes of lingual frenulum abnormalities

The main causes are related to genetic factors and embryonic development. During pregnancy, the frenulum forms from tissues that connect the tongue to the floor of the mouth; if this tissue does not develop or resorb properly, the frenulum becomes shorter or thicker than normal, restricting tongue movement.

It has been observed that ankyloglossia can run in families, suggesting a hereditary component that influences the length, thickness, and elasticity of the frenulum. In addition, less common factors, such as abnormalities in tissue differentiation during embryonic development, may contribute to its occurrence. In general, these congenital causes account for the vast majority of cases, while acquired factors such as scarring or trauma are much less common.

Symptoms

The symptoms of ankyloglossia vary depending on the patient's age and the degree of restriction of the frenulum, but they generally affect basic tongue functions. Among the most common are:

Breastfeeding difficulties in newborns: trouble latching on properly, ineffective sucking, and pain for the mother during breastfeeding.

Speech disorders: difficulty pronouncing certain sounds such as “l,” “r,” “t,” “d,” or “n,” especially in school-age children.

Limited tongue mobility: inability to lift the tongue toward the roof of the mouth, extend it outward, or touch the upper teeth with the tip of the tongue.

Dental problems: misaligned teeth, diastemas (gaps between teeth), or plaque buildup in the front teeth due to difficulty cleaning them properly.

Discomfort or tightness when eating or swallowing: a feeling of tension in the frenulum when moving the tongue, which can make it difficult to swallow certain foods.

In adults, these symptoms may be more subtle and sometimes manifest only as functional limitations or discomfort when speaking and chewing. Early detection of ankyloglossia allows for intervention before it leads to more serious complications.

Treatment

Treatment for ankyloglossia depends on the degree of restriction of the frenulum and its functional impact on the patient, and may be conservative or surgical.

In mild cases, when tongue mobility is only slightly limited and there are no issues with breastfeeding, speech, or swallowing, the approach may involve observation and follow-up, along with tongue mobility exercises guided by a speech-language pathologist to improve tongue function.

In moderate or severe cases, surgery is recommended, which can be performed by:

Frenectomy: a simple incision of the frenulum, typically performed on newborns or infants; it is a quick procedure with immediate recovery.

Frenuloplasty: a more complex surgical procedure that involves cutting and reshaping the frenulum; it is recommended for older children and adults, especially when it is necessary to improve tongue function and prevent restrictive scarring.

After surgery, it is important to perform tongue mobility exercises and follow up with a speech-language pathologist to ensure that the tongue regains full function and to prevent the formation of restrictive scar tissue.

Prevention of lingual frenulum disorders

Ankyloglossia is a congenital condition, so there is currently no known prenatal or postnatal prevention method that can guarantee its absence. It develops during embryonic development due to genetic factors or abnormalities in the formation of the lingual frenulum, which cannot be corrected before birth.

However, early detection is possible to minimize its effects. Neonatal screening and pediatric checkups can identify ankyloglossia from the first days of life, especially if it causes difficulties with breastfeeding. Early intervention, combined with speech-language therapy, can prevent problems with speech, swallowing, or dental development, although it does not “prevent” the condition itself from occurring.