Understanding Hyperdontia: Causes, Symptoms, and Dental Solutions
Updated: 2 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 19, 2026
Quick Answer: What Is Hyperdontia?
Hyperdontia is the medical term for having extra teeth, which can appear anywhere in the mouth, singly or in clusters, and may be visible or hidden beneath the gums. [1] The most common type is the mesiodens, which grows behind the upper front teeth. [1] [2] The exact cause is unknown, but genetics and overactive dental cells are believed to play a role. [1] [2]
What the research says
Removing the extra tooth alone often isn’t enough to bring a blocked front tooth down. A systematic review and meta-analysis of 15 studies (1,058 participants, mean age 9.1 years) of impacted upper front teeth found that 57.6% (95% CI 47.8–67.0) erupted after removal of the supernumerary tooth alone, compared with 82.4% when space was also created and 96.9% when orthodontic traction was added. The authors rate the certainty of evidence as very low to low. (Seehra et al., Am J Orthod Dentofacial Orthop, 2023) [3]
Cleft lip and palate are linked to extra teeth. A systematic review of 99 studies (37 in the meta-analysis) found a significant association between orofacial clefts and supernumerary teeth (odds ratio 4.04; 95% CI 1.26–12.99), though the quality of evidence was very low. (Fonseca-Souza et al., Clin Oral Investig, 2022) [4]
The link is strongest right at the cleft. A later meta-analysis of 75 articles and 27,703 patients (16,450 with nonsyndromic clefts and 11,253 healthy controls) found higher odds of a supernumerary tooth inside the cleft area of the permanent dentition (odds ratio 10.03; p < 0.0001); the authors rate the evidence quality as moderate. (Azevedo et al., Oral Dis, 2025) [5]
Key Takeaways
What is hyperdontia, or having extra teeth?
In a typical mouth, a child develops 20 primary teeth, which are eventually replaced by 32 permanent adult teeth. [1] Hyperdontia disrupts this standard count by introducing “supernumerary” teeth. These extra teeth can grow on one or both sides of the mouth and may be shaped like normal teeth or appear as irregular masses. [1]
Common Locations and Types
Physical Shapes
Extra teeth are also classified by their appearance:
What symptoms and discomfort can hyperdontia cause?
For many people, the only symptom of hyperdontia is the presence of an extra tooth, though impacted teeth or overcrowding can cause pain, swelling and chewing problems. [1] However, if the tooth is impacted or causes overcrowding, it can lead to:
Pain and Tenderness: Pressure on the surrounding teeth and jawbone.
Swelling: Inflammation of the gums near the extra tooth.
Chewing Difficulties: Interference with the natural alignment of the bite.
Overcrowding: Pushing existing teeth out of alignment, leading to crookedness. [1]
What causes hyperdontia, and what conditions are associated with it?
Hyperdontia may be linked to genetics, an overactive dental lamina and certain syndromes, although its precise cause is still being researched. [1] [2]
Genetics: A family history of extra teeth increases the likelihood of the condition.
Overactive Dental Lamina: The cells responsible for tooth development may trigger the growth of extra teeth. [1] [2]
Associated Syndromes: Hyperdontia is significantly more common in individuals with certain genetic conditions, including cleft lip and cleft palate, Gardner syndrome, Down syndrome, cleidocranial dysplasia, and Ehlers-Danlos syndrome. [1] [4]
What complications can hyperdontia cause?
Unmanaged hyperdontia can lead to tooth impaction, a bad bite, more tooth decay and, rarely, oral cysts around impacted extra teeth. [1]
Tooth Impaction: The extra tooth becomes trapped in the jawbone, potentially damaging the roots of adjacent teeth.
Malocclusion: A “bad bite” that can cause jaw pain and wear down tooth enamel.
Increased Decay Risk: Overcrowding makes it difficult to brush and floss effectively, leading to cavities and gum disease. [1]
Oral Cysts: In rare cases, noncancerous cysts can form around impacted extra teeth. [1]
How is hyperdontia diagnosed and assessed by a dentist?
Dentists typically identify hyperdontia during routine checkups. [1]
Visual Examination: For teeth that have already erupted through the gums.
Dental X-rays: Essential for locating impacted teeth hidden beneath the surface. [1]
CT Scans: Used for complex cases to map the exact position of extra teeth relative to nerves and roots.
How is hyperdontia managed and treated?
Treatment for hyperdontia is highly personalized. If the extra teeth are not causing pain or health issues, a dentist may simply monitor them during regular visits. [1] [2]
Scenario | Recommended Action |
Functional Interference | Extraction to improve chewing or speech. |
Overcrowding | Extraction followed by orthodontic work (braces). |
Pain or Infection | Immediate extraction and possible antibiotics. |
Cosmetic Concerns | Extraction if the patient is embarrassed by their appearance. [1] |
Asymptomatic |
What is the outlook for hyperdontia, and can it be prevented?
Hyperdontia is not a life-threatening condition, [1] and the prognosis for those who receive treatment is excellent. While the condition itself cannot be prevented, early detection through regular pediatric dental visits can minimize the risk of overcrowding and impaction. [1]
Conclusion
Hyperdontia is a unique dental abnormality that affects a small percentage of the population. Whether you have a single extra tooth or a cluster of supernumerary teeth, the key to maintaining oral health is consistent professional monitoring. By addressing complications like overcrowding or impaction early, you can ensure a functional, healthy smile for a lifetime.
Frequently Asked Questions
How common is hyperdontia?
Hyperdontia affects approximately 1% to 4% of the population, depending on the study, and is more common in adult teeth than in baby teeth.
Can extra teeth grow back after extraction?
No. Once a supernumerary tooth is removed, it does not grow back. However, a person may have multiple extra teeth in the same area.
Does hyperdontia always cause pain?
No. Many people are unaware they have extra teeth until they are discovered during a routine dental X-ray.
At what age is hyperdontia usually diagnosed?
Hyperdontia is often caught in childhood when permanent teeth begin to erupt, though it can be diagnosed at any age through X-rays.
What is a “mesiodens”?
A mesiodens is the most common type of extra tooth, appearing in the midline of the upper jaw, usually behind the two front teeth. [1] [2]
Can hyperdontia affect speech?
Yes, if the extra teeth are positioned in a way that interferes with the tongue’s movement or the closure of the lips.
Is hyperdontia hereditary?
There is a strong genetic component; if a parent has had extra teeth, their children are at a higher risk.
What happens if I don’t remove an extra tooth?
If it isn’t causing issues, nothing may happen. However, it could eventually lead to crowding, cysts, or damage to nearby tooth roots.
Is tooth extraction for hyperdontia painful?
The procedure is performed under local anesthesia or sedation, so you won’t feel pain during the surgery. Post-operative discomfort is usually managed with over-the-counter pain relievers.
Can extra teeth cause cavities?
Indirectly, yes. They often cause overcrowding, which creates tight spaces that are difficult to clean, leading to plaque buildup and decay.
What is an “impacted” extra tooth?
An impacted extra tooth is a tooth that has formed but failed to break through the gums, remaining trapped in the jawbone.
Can hyperdontia be caused by an accident?
No. Hyperdontia is a developmental condition, not the result of trauma or injury.
Do extra teeth look like normal teeth?
Sometimes. “Supplemental” supernumerary teeth look normal, but others may be cone-shaped or just irregular lumps of dental tissue. [1]
Is hyperdontia more common in the upper or lower jaw?
Can extra teeth cause gum disease?
Yes, by making it harder to clean the gum line in crowded areas, leading to inflammation and infection. [1]
What is Gardner syndrome?
A genetic disorder that causes multiple polyps in the colon and is often associated with supernumerary teeth.
Can extra teeth cause headaches?
If they cause significant jaw misalignment or pressure (malocclusion), they can contribute to jaw pain that radiates as a headache.
How many extra teeth can a person have?
Most people have only one, but in rare cases associated with specific syndromes, a person can have dozens of extra teeth.
Can a regular dentist treat hyperdontia?
Yes, though complex cases involving impacted teeth may be referred to an oral surgeon.
Does insurance cover the removal of extra teeth?
Most dental insurance plans cover extractions if they are deemed medically or dentally necessary.
Can hyperdontia cause cysts?
Yes, a dentigerous cyst can form around the crown of an impacted supernumerary tooth.
What is the “dental lamina”?
The dental lamina is a band of epithelial tissue that provides the first evidence of tooth development in a fetus.
Can extra teeth affect wisdom teeth?
Yes, they can take up the space needed for wisdom teeth to erupt, leading to further impaction issues.
Are extra teeth common in people with Down syndrome?
Yes, hyperdontia is one of several dental abnormalities more frequently seen in individuals with Down syndrome. [1]
Can extra teeth be used as replacements?
In very rare orthodontic cases, a supplemental extra tooth might be kept if a primary tooth is missing, but this is uncommon.
What is a “distomolar”?
An extra tooth that grows behind the third molar (wisdom tooth). [1]
Can hyperdontia be detected before a child is born?
No, it is typically diagnosed after birth once teeth begin to develop or through early childhood X-rays.
Does hyperdontia affect the shape of the face?
Only in extreme cases where a large number of extra teeth cause significant swelling or bone distortion.
What is an “odontoma”?
A benign tumor of dental origin that can look like a small mass of teeth or a single large, deformed tooth. [1]
Can extra teeth cause bad breath?
If they cause overcrowding that traps food and bacteria, they can contribute to halitosis.
Is hyperdontia the same as “shark teeth”?
“Shark teeth” is a common term for when permanent teeth grow in behind baby teeth before they fall out. While it looks like extra teeth, it is usually a temporary developmental stage, not true hyperdontia.
Can hyperdontia cause ear pain?
Jaw misalignment (malocclusion) caused by extra teeth can sometimes lead to referred pain in the ear area.
What is “cleidocranial dysplasia”?
A rare genetic condition that affects the development of bones and teeth, often resulting in many supernumerary teeth. [2]
Can extra teeth be visible on the roof of the mouth?
Yes, extra teeth in the upper jaw often erupt toward the palate (roof of the mouth).
How long does it take to recover from a supernumerary tooth extraction?
Most people recover within a few days to a week, depending on the complexity of the extraction.
Can extra teeth be removed with braces?
Braces move teeth but cannot remove them. Extraction is usually done before or during orthodontic treatment.
Are extra teeth more common in baby teeth or adult teeth?
Can hyperdontia cause sinus problems?
In rare cases, extra teeth in the upper jaw can grow upward toward the maxillary sinuses.
What is an “atavism”?
A biological phenomenon where a trait from a distant ancestor reappears in a modern individual; some experts think hyperdontia is an atavism. [1]
Can hyperdontia affect the roots of other teeth?
Yes, the pressure or position of an extra tooth can sometimes cause the roots of healthy teeth to dissolve (resorption).
What is a “paramolar”?
A small, supernumerary tooth that grows alongside a molar. [1]
Can extra teeth cause difficulty swallowing?
Unlikely, unless the teeth are extremely large and positioned far back in the mouth, interfering with the tongue’s function.
Is hyperdontia more common in certain ethnicities?
Some studies suggest higher rates in certain populations, but it is found globally across all ethnic groups.
Can extra teeth be non-functional?
Yes, most supernumerary teeth do not contribute to chewing and are considered non-functional.
What is the difference between hyperdontia and hypodontia?
Hyperdontia is having too many teeth; hypodontia is having too few (missing teeth).
Can extra teeth be white or discolored?
Extra teeth are usually the same color as normal teeth but may be prone to staining if they are difficult to clean.
Do supernumerary teeth have nerves?
Yes, they have a pulp chamber and nerves just like regular teeth. [2]
Can hyperdontia be diagnosed without an X-ray?
Only if the extra teeth have erupted and are visible. Impacted teeth require imaging to diagnose. [1]
Is hyperdontia a disability?
No, it is a dental abnormality that is usually easily managed.
Can I live a normal life with hyperdontia?
Absolutely. Many people live their entire lives with extra teeth without ever needing treatment.
Related Reading
Gardner Syndrome: Symptoms, Causes, Diagnosis, Treatment, and Outlook — What You Need to Know explains a genetic syndrome that can cause extra teeth.
Understanding Impacted Teeth: Types, Symptoms, and Care explains teeth that cannot erupt, a common effect of extra teeth.
Dental X-Rays: Types, What They Show, Safety and How Often You Need Them explains dental X-ray types and how they reveal hidden teeth.
Tooth Extraction: Procedure, Recovery Timeline, Aftercare and Warning Signs walks through tooth removal, recovery and aftercare.
References
Cleveland Clinic. Hyperdontia (extra teeth): symptoms, causes & treatment. Cleveland Clinic. Last updated October 3, 2023. https://my.clevelandclinic.org/health/diseases/hyperdontia
McKinney R, Pitzer J, Daley JO. Developmental disturbances of the teeth, anomalies of number. In: StatPearls [Internet]. Treasure Island (FL): StatPearls Publishing; updated July 7, 2025. PMID 34424644. https://www.ncbi.nlm.nih.gov/books/NBK573071/
Seehra J, Mortaja K, Wazwaz F, et al. Interventions to facilitate the successful eruption of impacted maxillary incisor teeth due to the presence of a supernumerary: a systematic review and meta-analysis. Am J Orthod Dentofacial Orthop. 2023;163(5):594-608. PMID 36907703. https://doi.org/10.1016/j.ajodo.2023.01.004
Fonseca-Souza G, de Oliveira LB, Wambier LM, et al. Tooth abnormalities associated with non-syndromic cleft lip and palate: systematic review and meta-analysis. Clin Oral Investig. 2022;26(8):5089-5103. PMID 35729285. https://doi.org/10.1007/s00784-022-04540-8
Azevedo SG, de Oliveira LQR, Martelli-Júnior H, et al. Tooth anomalies in patients with nonsyndromic orofacial cleft: a systematic review and meta-analysis. Oral Dis. 2025;31(7):2026-2045. PMID 39760181. https://doi.org/10.1111/odi.15226
Medical disclaimer
The information provided in this article is for educational purposes only and should not be considered medical advice. Always consult with a qualified dentist or oral surgeon for diagnosis and treatment of any dental condition.
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