Number of adult teeth in humans

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Number of Adult Teeth in Humans: Key Facts

Typical Number of Adult Teeth in Humans

Most adult humans have 32 permanent teeth, which includes the third molars, commonly known as wisdom teeth. If the third molars are excluded, the typical number is 28 teeth Zhu2015Oeschger2022. This standard count is often used in dental and health research to classify full dentition.

Variations in Adult Tooth Count

Some adults may have fewer than 32 teeth due to congenital absence (tooth agenesis), extractions, or other dental issues. The prevalence of congenital absence of one or more permanent teeth (including third molars) is about 22.6%, and 6.4% if third molars are not considered . Tooth loss is also common with aging, disease, or trauma, leading to a wide range in the number of teeth among adults Zhu2015Chu2023Zhang2022+1 MORE.

Classification of Tooth Count in Research

Research studies often classify adults into groups based on the number of natural teeth:

Full dentition (28 or more teeth, excluding third molars)
21–27 teeth
1–20 teeth
Edentulous (no natural teeth)

These groupings help researchers study the impact of tooth loss on health outcomes.

Importance of Tooth Count for Health

The number of natural teeth in adults is linked to various health outcomes. Fewer teeth are associated with higher risks of metabolic syndrome, cognitive frailty, dementia, and depressive symptoms Zhu2015Chu2023Zhang2022+1 MORE. Maintaining more teeth is associated with better overall health and longer dementia-free life expectancy Zhang2022Kiuchi2024.

Self-Reporting of Tooth Count

Self-reported tooth counts are generally accurate and correlate well with clinical examinations, making them a valid method for large-scale health surveys .

Conclusion

In summary, most adults have 32 permanent teeth, including wisdom teeth, or 28 if wisdom teeth are excluded. However, many adults have fewer teeth due to various factors. The number of teeth is not only a dental concern but also an important indicator of general health and well-being.

Sources and full results

Most relevant research papers on this topic

Associations between the number of natural teeth and metabolic syndrome in adults.

The number of natural teeth is inversely associated with the presence of metabolic syndrome in adults, with higher tooth loss increasing the odds of metabolic syndrome.

Observational StudyRigorous Journal

2015·

62citations

·Yong-fei Zhu et al.

Journal of clinical periodontology·

DOI

Association of a lesser number of teeth with more risk of developing depressive symptoms among middle-aged and older adults in Japan: A 20-year population-based cohort study.

A small number of teeth after age 40 is associated with a higher risk of developing depressive symptoms in middle-aged and older adults, particularly men.

Observational Study

2023·

6citations

·W. Chu et al.

Journal of psychosomatic research·

DOI

Validity of the self-reported number of teeth in Chilean adults

Self-reported tooth count in Chilean adults correlates with clinical examination results, making it a valid method for national health surveys.

Observational StudyVery Rigorous Journal

2019·

26citations

·P. Margozzini et al.

BMC Oral Health·

DOI

Number of Teeth Is Related to Craniofacial Morphology in Humans

A reduced number of teeth is linked to a less convex profile and a shorter face in modern humans, suggesting a relationship between teeth number and overall craniofacial development.

Observational Study

2022·

23citations

·Elias S. Oeschger et al.

Biology·

DOI

The Association between Number of Teeth and Cognitive Frailty in Older Adults: A Cross-Sectional Study

Older adults with 20 or more teeth have a lower risk of cognitive frailty, emphasizing the importance of maintaining as many teeth as possible throughout life.

Observational StudyRigorous Journal

2022·

13citations

·X. Zhang et al.

The Journal of Nutrition, Health & Aging·

DOI

Number of Teeth and Dementia-free Life Expectancy: A 10-Year Follow-Up Study From the Japan Gerontological Evaluation Study.

Having more teeth is associated with longer dementia-free and total life expectancies in older adults aged 65 years.

Observational Study

2024·

9citations

·S. Kiuchi et al.

Journal of the American Medical Directors Association·

DOI

Validity of self-reported number of teeth in middle-aged Finnish adults: the Northern Finland Birth Cohort Study 1966

Self-reported number of teeth in middle-aged Finnish adults closely matched the corresponding clinical measure, with a mean difference of 0.02 between the two values.

Observational StudyRigorous Journal

2018·

25citations

·Toni Similä et al.

BMC Oral Health·

DOI

Number of Teeth and Incidence of Hip Fracture in Older Adults Aged ≥75 Years: The OHSAKA Study

The number of sound and filled teeth predicts the risk of hip fractures in women aged 75 years or older, while no association was observed between the number of teeth and hip fractures in men.

Observational Study

2025·

0citations

·Naoko Otsuki et al.

Journal of Epidemiology·

DOI

Numbers of Natural Teeth, Diet, and Nutritional Status in US Adults

People with fewer than 28 natural teeth have significantly lower intakes of carrots, tossed salads, and dietary fiber, and lower serum levels of beta carotene, folate, and vitamin C compared to fully dentate individuals.

Observational StudyHighly Cited

2007·

202citations

·R. Nowjack-Raymer et al.

Journal of Dental Research·

DOI

Association of Number of Teeth Present With Nutrient Intake and Food Group Consumption

The number of teeth is independently associated with poor nutritional status in Japanese adults without a history of four major diseases.

Observational Study

2025·

0citations

·Mayuka Asaeda et al.

Journal of Oral Rehabilitation·

DOI

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