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Researchers from Northumbria University have uncovered compelling evidence that smoking leaves a lasting biological record in the human body—specifically, deep within the structure of teeth. This discovery, published in the scientific journal PLOS One, marks the first time scientists have demonstrated the permanent impact of tobacco use on dental tissues, visible even after a person has quit smoking.
How Smoking Alters Teeth
Teeth are composed of three main hard tissues: enamel, dentine, and cementum. Cementum, which covers the tooth root, develops annual growth rings similar to those found in trees. The research team initially set out to use these rings to estimate the age of individuals for forensic purposes, such as identifying disaster victims or unknown remains.
However, when examining 88 teeth from living dental patients and archaeological remains, the scientists noticed disruptions in the cementum rings of some teeth but not others. These disruptions appeared as variations in the thickness and regularity of the rings. Further investigation revealed that these irregularities were strongly associated with individuals who were current or former smokers.
Key Findings
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Smoking Damage: Evidence of smoking damage was found in 70% of ex-smokers and 33% of current smokers, compared to just 3% of non-smokers.
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Cementum Thickness: The cementum was thicker in ex-smokers, likely due to the tissue returning to normal levels after quitting, resulting in stronger deposits over the previously damaged areas. Current smokers continued to show disrupted cementum levels.
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Forensic and Historical Applications: The findings could revolutionize forensic science and historical research, offering new ways to identify unknown individuals and gain insights into past lifestyles and tobacco use.
Case Example
One living donor, aged 58 at the time of tooth extraction, had a history of smoking between the ages of 28 and 38. The researchers were able to identify smoking-related damage in the tooth that occurred during that period, demonstrating the method’s potential to pinpoint specific life events.
Implications for Archaeology and Health
The study also examined teeth from archaeological remains dating from 1776 to 1890. Remarkably, these ancient teeth showed the same patterns of disruption seen in modern smokers, opening new avenues for understanding the long-term health effects of tobacco use throughout history.
Expert Commentary
Dr. Ed Schwalbe, Associate Professor at Northumbria University, stated: “Our research shows that it’s possible to tell if someone was a smoker just by examining their teeth. We found that the regular annual deposition of rings was disrupted for some individuals and realized that these disruptions were associated with current or ex-smokers, but were very rare in non-smokers.”
Dr. Valentina Perrone added: “This study shows, for the first time, the biological record of smoking-related oral health damage within the dental structure.”
Disclaimer
The information in this article is based on a recent scientific study and is intended for general knowledge and informational purposes only. It does not constitute medical advice. Readers are encouraged to consult healthcare professionals for personalized guidance regarding smoking cessation and oral health. The study’s findings may not apply to every individual, and further research is needed to confirm and expand upon these results.
