A mesiodens tooth is the most common form of supernumerary (extra) tooth seen in children. It usually develops in the midline of the upper jaw, between the two permanent front teeth, and may interfere with normal tooth eruption if not diagnosed early.
This comprehensive guide explains what mesiodens is, where it can occur, its genetic causes, diagnostic process, treatment timing, surgical considerations, and how it fits within the broader category of supernumerary teeth.
What Is a Mesiodens Tooth?
A mesiodens is a developmental dental anomaly defined as an extra tooth located between the maxillary central incisors.
Another Term to Describe Mesiodens
Mesiodens is also known as:
Midline supernumerary tooth
Anterior supernumerary tooth
These terms describe the same condition based on anatomical location.
Understanding Supernumerary Teeth (SEO Cluster Anchor)
Supernumerary teeth are teeth that develop in excess of the normal dental number. Mesiodens is the most frequently diagnosed supernumerary tooth in pediatric dentistry, but extra teeth can occur elsewhere in the mouth.
Types of Supernumerary Teeth
Mesiodens – between upper front teeth
Lingual mesiodens – behind the incisors toward the palate
Distomolars – extra molars behind wisdom teeth
Paramolars – beside molars
Supplemental teeth – resemble normal teeth in shape
Can a Mesiodens Be Anywhere Else in the Mouth?
A true mesiodens is limited to the maxillary midline.
An extra tooth between teeth 19 and 20 (lower molars) is not a mesiodens. Extra teeth in that region are classified as:
Supernumerary premolars
Supernumerary molars
This distinction is important for diagnosis and treatment planning.
Lingual Mesiodens: Extra Tooth Behind the Incisor
A lingual mesiodens is positioned behind the upper front teeth, toward the palate. These teeth are often:
Impacted
Not visible in the mouth
Discovered incidentally on dental X-rays
Lingual positioning increases the likelihood of delayed eruption and orthodontic complications.
How Common Is Mesiodens in Children?
Occurs in approximately 0.15%–3% of the population
More common in boys
Typically diagnosed between ages 6–9
Often detected during routine pediatric dental imaging
Genetic Causes of Mesiodens and Gemination
Genetic Causes of Mesiodens
Familial inheritance patterns
Hyperactivity of the dental lamina
Developmental disturbances during odontogenesis
Mesiodens vs Gemination
Mesiodens: a completely separate extra tooth bud
Gemination: partial splitting of a single tooth bud resulting in one enlarged tooth
Both share genetic influences but are distinct dental anomalies.
How Mesiodens Affects Oral Health
A mesiodens may lead to:
Midline diastema (gap between front teeth)
Delayed or failed eruption of permanent incisors
Crowding and rotation
Root resorption of adjacent teeth
Mobility of adult teeth in severe or untreated cases
Cyst formation (rare but clinically significant)
Persistent midline spacing in the mouth is a common clinical sign.
Can Mesiodens Cause Mobility of an Adult Tooth?
Yes. In rare cases, pressure from a mesiodens can:
Damage adjacent tooth roots
Cause resorption
Lead to loosening or mobility of permanent teeth
Early diagnosis prevents irreversible damage.
Diagnosis of Mesiodens
Diagnosis involves:
Clinical examination
Periapical or panoramic X-rays
CBCT imaging is used when precise localization is required
Does Mesiodens Need Elevation?
When removal is indicated, surgical elevation of the mesiodens is performed to safely access and extract impacted teeth while protecting nearby structures.
Mesiodens in Children vs Adults
In Children
Primary concern: blocked eruption
Early removal often allows spontaneous eruption
Reduces orthodontic complexity
In Adolescents and Adults
Higher chance of orthodontic intervention
Increased surgical difficulty due to bone density
Delayed treatment may prolong braces or corrective care
When Should a Mesiodens Be Removed?
Removal is recommended when the mesiodens causes or risks:
Delayed eruption of incisors
Midline spacing
Orthodontic interference
Tooth mobility
Infection or cyst formation
When Observation Is Appropriate
Asymptomatic
Favorable position
No eruption disturbance
Under periodic radiographic monitoring
Best Age to Remove a Mesiodens Tooth
Ideal age: 6–9 years (mixed dentition)
Early removal improves eruption outcomes
Delayed treatment increases orthodontic needs
Orthodontic and Surgical Considerations
Mesiodens is frequently identified during orthodontic assessments.
Management may involve:
Surgical extraction
Monitoring spontaneous eruption
Orthodontic alignment
Interdisciplinary care between dentist, orthodontist, and oral surgeon
Frequently Asked Questions
What does an extra tooth behind the incisor mean?
Usually a lingual mesiodens or another supernumerary tooth.
Which of the following is another term for mesiodens?
Midline supernumerary tooth.
Can mesiodens occur in the lower jaw?
No. True mesiodens occurs only in the upper midline.
Can mesiodens grow back after removal?
No.
Can mesiodens cause midline diastema?
Yes. It is one of the most common clinical signs.
Conclusion
A mesiodens tooth is a manageable pediatric dental condition when identified early. As the most common form of supernumerary teeth, it requires accurate diagnosis, individualized treatment planning, and timely intervention to prevent long-term complications. Regular dental visits during childhood remain the most effective strategy for early detection and optimal oral development.
