When most people think about the complications of diabetes, they usually think about vision problems, kidney disease, nerve damage, or heart disease.
Dentists and doctors, however, have long suspected that the disease may also have serious effects on the mouth.
A major new study from Sweden now provides some of the strongest evidence yet that diabetes can significantly increase the risk of tooth loss, gum disease, and complications involving dental implants.
The research was carried out by Anna Trullenque Eriksson as part of her doctoral thesis at the University of Gothenburg.
Her work used information collected from seven national Swedish health registers and included one of the largest groups of people ever studied for this topic.
The scale of the research allowed scientists to examine the long-term relationship between diabetes and oral health with much greater accuracy than before.
Oral health is an important part of overall health. Healthy teeth and gums allow people to eat comfortably, speak clearly, and maintain good nutrition. When oral disease develops, the consequences can be serious. Gum disease can damage the bone supporting the teeth, while tooth loss can affect quality of life, nutrition, self-confidence, and even general health.
The researchers focused on three major oral health problems. The first was periodontitis, commonly called gum disease. The second was tooth loss. The third was peri-implantitis, a disease that causes inflammation around dental implants and can eventually lead to implant failure.
The findings showed a clear relationship between diabetes and all three conditions.
Among people with type 1 diabetes, those who maintained good blood sugar control experienced far fewer problems than those whose blood sugar levels remained high. In fact, their risk of tooth loss and gum disease was much closer to that of people without diabetes.
The situation was different for type 2 diabetes. Even when blood sugar was reasonably well controlled, people with type 2 diabetes still had a higher risk of gum disease and tooth loss than people without diabetes. Poor blood sugar control increased the risk even further.
The study included more than 86,000 people with type 1 diabetes and more than 786,000 people with type 2 diabetes. Such large numbers provide a rare opportunity to identify patterns that smaller studies might miss.
The researchers found that nearly half of the people with type 2 diabetes lost at least one tooth during a ten-year period. Among those with poor blood sugar control, the proportion was even higher. Severe tooth loss involving five or more teeth was also much more common among people with diabetes.
Dental implants, often viewed as a permanent solution for missing teeth, were not immune to the effects of diabetes. People with either type 1 or type 2 diabetes were more likely to develop inflammation around implants and more likely to lose the implants altogether. Again, blood sugar control appeared to be a key factor.
Scientists believe inflammation plays a central role in explaining these findings. Diabetes is associated with increased levels of inflammation throughout the body.
High blood sugar can also impair healing and weaken the body’s defenses against infection. Since gum disease and peri-implantitis are inflammatory conditions triggered by bacteria, diabetes may create an environment where these diseases can thrive.
One particularly important discovery involved socioeconomic factors. The researchers found that people with diabetes who also had lower incomes or lower educational levels faced the highest risk of complete tooth loss.
This finding demonstrates that medical conditions do not exist in isolation. Access to healthcare, education, income, and social support can all influence health outcomes.
The study also found evidence that the relationship works in both directions. People with periodontitis had a higher risk of developing diabetes-related complications affecting the eyes and kidneys. This suggests that oral disease may contribute to the overall burden of diabetes rather than being merely a consequence of it.
These findings support a growing movement within healthcare that encourages closer collaboration between physicians and dental professionals.
Managing diabetes may require attention not only to blood sugar levels but also to oral health. Likewise, dentists may play an important role in identifying people who are at risk of developing more serious diabetes complications.
The researchers argue that dental care should become a more visible part of diabetes prevention and management programs. Regular dental visits, early treatment of gum disease, good oral hygiene habits, and careful blood sugar control may all help reduce long-term complications.
In reviewing and analyzing the study, several strengths stand out. The research involved an exceptionally large number of participants and used high-quality national health records collected over many years. This makes the findings more reliable than many earlier studies.
The results consistently showed that diabetes, especially when poorly controlled, is associated with worse oral health outcomes. The findings regarding dental implants are particularly important because relatively little research has previously examined long-term implant outcomes in people with diabetes.
Although the study cannot prove direct cause and effect, the evidence strongly supports the idea that diabetes and oral health are closely connected.
The research highlights the importance of viewing the mouth as part of the whole body and suggests that better integration of medical and dental care could improve outcomes for millions of people living with diabetes.
If you care about tooth health, please read studies about an important causes of tooth decay and gum disease, and common tooth disease that may increase risks of dementia.
For more health information, please see recent studies about mouthwash that may increase your tooth damage, and results showing this diet could help treat gum disease.
The research was conducted at the University of Gothenburg.
