Hypodontia (Missing Teeth): A Comprehensive Guide to Congenital Missing Teeth and Dental Recovery
Updated: 3 days ago
Medically reviewed by Dr. Baraa Alnahhal, MD · Last reviewed: October 2026
Quick Answer
Hypodontia is a congenital condition in which one to five permanent teeth do not develop as they should, a form of tooth agenesis. It affects 2% to 8% of the general population and is mainly caused by inherited gene changes. Commonly missing teeth include upper lateral incisors and second premolars. Treatment aims to restore chewing, speech and appearance. [1]
What the research says
Hypodontia is more common in the permanent teeth of people with cleft lip and palate. A systematic review and meta-analysis of seven retrospective cohort studies found a pooled hypodontia prevalence of 32% in permanent teeth compared with 12% in primary teeth in people with non-syndromic cleft lip and palate. There was significant heterogeneity between the studies. (Srivastav et al., Cleft Palate Craniofac J, 2025)
Childhood cancer treatment is linked to tooth agenesis. In a meta-analysis of 31 studies, the pooled prevalence of tooth agenesis in pediatric cancer patients was 22% (95% CI 14% to 25%), and the odds were higher than in healthy individuals (unadjusted OR 3.12, 95% CI 2.01 to 4.83). (Proc et al., Dent Med Probl, 2025)
What is hypodontia?
Hypodontia is a congenital disorder, which means it is present from birth, in which some permanent teeth do not form. It is a form of tooth agenesis, the term providers use for congenitally missing teeth. Baby teeth usually come in on schedule, but some permanent teeth never form. [1]
Hypodontia involves one to five missing teeth. When six or more teeth are missing, the condition is called oligodontia. [1]
Symptoms
Hypodontia is often noticed when baby teeth fall out and no permanent teeth replace them. Children usually start losing baby teeth at about age 6, and permanent teeth normally come in between ages 6 and 14. [1]
Persistent gaps: Spaces where a baby tooth fell out and no permanent tooth appeared.
Small or peg-shaped teeth: The teeth that do form may be small, cone-shaped or have gaps between them.
Missing teeth in common spots: Upper lateral incisors (next to the two front teeth), and upper and lower second premolars.
Small or cone-shaped teeth can also be a sign of other conditions, such as ectodermal dysplasia, amelogenesis imperfecta or a craniofacial syndrome. [1]
Causes and risk factors
Heredity is the most common cause. Several genes control how permanent teeth form, and changes to these genes affect the dental lamina, the band of tissue that anchors teeth. [1]
Complications if untreated
Difficulty chewing and speaking
Gum damage
A smaller-than-normal jaw if jawbone development is affected
Misaligned teeth, which can lead to temporomandibular joint (TMJ) disorder
Self-consciousness, avoiding social situations and social isolation
These complications are listed by Cleveland Clinic. [1]
Diagnosis and severity
A dentist examines the teeth and mouth and takes dental X-rays to look for missing permanent teeth. X-rays help tell the difference between a tooth that never formed and one that is just late to come in. [1]
Severity | Number of missing teeth |
Mild | 1 or 2 |
Moderate | 3 to 5 |
Severe | 6 |
Grading is by the number of missing teeth. [1]
Treatment options
Treatment changes as the jaw develops. For example, a child may wear a partial denture until their teens and then move to an implant or bridge. A dentist or orthodontist will advise on timing. [1]
When to see a dentist: See a dentist if permanent teeth do not come in soon after baby teeth fall out. Some teeth may just be late, so an early evaluation helps tell the difference between a delay and hypodontia.
Outlook and living with hypodontia
Treatment often cures the condition. Children may feel self-conscious about smiling, talking or eating around others, including while they wear braces or dentures. Support groups for children with hypodontia can help, and good oral hygiene is essential, especially with braces or dentures. [1]
Conclusion
Hypodontia is common, treatable and usually inherited. With an early dental evaluation and a plan that grows with the child, most people can restore chewing, speech and a confident smile. [1]
Frequently Asked Questions
Is hypodontia the same as losing a tooth in an accident?
No. Hypodontia is present from birth, which means the permanent tooth never formed.
Does hypodontia affect wisdom teeth?
Wisdom teeth are not counted in hypodontia. It can affect any other permanent tooth. [1]
What is the difference between hypodontia and oligodontia?
Hypodontia means one to five missing teeth. Oligodontia means six or more. [1]
How common is hypodontia?
Hypodontia affects 2% to 8% of the general population. [1]
Which teeth are most often missing?
Teeth that may be missing include the upper lateral incisors, upper second premolars and lower second premolars. [1]
What causes hypodontia?
Heredity is the most common cause. Associated factors include cleft palate, Down syndrome, ectodermal dysplasia, rubella or candida infection during pregnancy, and low birth weight. [1]
How is hypodontia diagnosed?
A dentist examines the teeth and mouth and uses dental X-rays. [1]
How is severity graded?
Mild is 1 or 2 missing teeth, moderate is 3 to 5 and severe is 6. [1]
What happens if the gaps are not treated?
Complications can include trouble chewing and speaking, gum damage, a smaller jaw, misaligned teeth that can lead to TMJ disorder, and social self-consciousness. [1]
Can braces alone fix the problem?
Braces can move teeth together to close gaps. Other options include partial dentures, bridges and implants, depending on the case. [1]
Will my child need surgery?
Dental implants involve a procedure. A dentist or orthodontist will advise which treatment fits and when.
Can baby teeth stay in place if there is no adult tooth underneath?
Sometimes. A dentist can advise whether a healthy baby tooth should be kept.
Are peg-shaped teeth always a sign of hypodontia?
No. Small or cone-shaped teeth can also be a sign of conditions such as ectodermal dysplasia or amelogenesis imperfecta. [1]
Can adults have hypodontia?
Yes. It is present from birth, so adults who have had missing teeth since childhood can be diagnosed.
Does hypodontia affect other parts of the body?
Hypodontia can be part of conditions such as ectodermal dysplasia, cleft palate and Down syndrome. [1]
Related Reading
Anodontia (Complete Absence of Teeth): Causes, Diagnosis, Treatment & Outlook explains the rarer condition where all teeth fail to develop.
Dental Implants: Types, Procedure, Recovery and Success Rates describes how implants replace missing teeth and what to expect.
Teeth Braces: Types, Timeline, Pain Relief and Aftercare Guide explains how braces close or open gaps before tooth replacement.
Understanding Impacted Teeth: Types, Symptoms, and Care covers teeth that form but fail to come in properly.
References
Cleveland Clinic. Hypodontia (Missing Teeth). Cleveland Clinic. Last updated April 22, 2026. https://my.clevelandclinic.org/health/diseases/24192-hypodontia-missing-teeth
Srivastav S, Hermann NV, Tewari N, Haldar P, Kreiborg S. Prevalence of Dental Anomalies in Primary vs. Permanent Dentition in Individuals with Non-Syndromic Cleft Lip and Palate: A Systematic Review and Meta-Analysis. Cleft Palate Craniofac J. 2025;63(9):3069-3081. PMID 41342785. https://doi.org/10.1177/10556656251398076
Proc P, Mlynarski W, Hardan L, et al. Prevalence of tooth agenesis in young cancer patients: A systematic review and meta-analysis. Dent Med Probl. 2025;62(4):739-750. PMID 40762440. https://doi.org/10.17219/dmp/176033
Medical disclaimer
This article is for general educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always seek the advice of your physician or other qualified healthcare provider with any questions you may have about a medical condition. Never disregard professional medical advice or delay seeking care because of something you have read here. If you think you may have a medical emergency, call your doctor or emergency services immediately.
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