A Healthy Mouth = A Healthy Body

How Successful Root Canal Treatment Can Improve Blood Sugar and Cholesterol
When you think of a root canal, the first thing that comes to mind is probably pain relief or saving a tooth. But new research shows that fixing an infected tooth might do much more than that. A healthy root canal can actually help balance your blood sugar and cholesterol. This can improve the overall health from the mouth outward.
Firstly, the mouth is not separate from the rest of the body. What happens inside it can affect everything else which includes the heart, blood and metabolism. A recent study by researchers at King’s College London has revealed that successful endodontic treatment which is commonly known as a root canal treatment can improve how the body handles glucose and lipids that circulate in our blood.
The researchers followed patients who had long-term tooth infections called apical periodontitis. These infections develop when bacteria invade the inner part of the tooth and spread to the bone around the root tip. The study found that after these infections were properly treated, the patients’ blood sugar and fat metabolism improved. In simple terms, cleaning up a bad tooth helped clean up the blood too.
Endodontic treatment or root canal treatment refers to a dental procedure that removes infection from deep inside a tooth while keeping the tooth itself intact. The term “endodontic” comes from Greek. “Endo” means inside while “odont” means tooth.
Inside every tooth is a soft tissue called the pulp which contains nerves and blood vessels. When bacteria from deep decay or injury reach the pulp, it becomes infected. If not treated, this infection can spread into the jawbone and cause inflammation around the root tip. That condition is painful and can damage bone and gum tissue.

During endodontic treatment, the infected part is removed, the inner canal is cleaned and sealed to prevent bacteria from entering either through the bottom, sides or from the top. It’s actually a 3 dimensional seal. Finally, a filling or a crown is placed to strengthen and protect the tooth. Once done, the infection clears and the tooth continues to function normally.
Some may wonder how a simple dental infection may negatively affect the entire body. It is simple. I will explain how this happens but I would suggest that you do not pay attention to a few medical terms used because this is for educational purposes. Now, when bacteria enter the bloodstream, the immune system responds by releasing inflammatory substances. This constant inflammation does not stay in the mouth. It travels throughout the body.
Over time, prolonged inflammation can make your cells resistant to insulin which is the hormone that controls blood sugar. This means sugar stays in your blood longer and can lead to higher sugar levels. Inflammation can also disturb how your body processes fats which can lead to raised cholesterol and triglycerides.
Even though the problem starts in your mouth, it can affect your heart, your blood vessels and your metabolism.
In the recent study that has been cited, 65 patients with infected teeth were followed for two years after successful endodontic treatment. Blood samples were taken before treatment and at several intervals afterward. Advanced techniques were used to measure changes in blood sugar, fat and inflammation levels.
The results were good. Glucose and pyruvate levels dropped. This showed that blood sugar control had improved. Cholesterol, choline, and fatty acids also decreased which means that fat metabolism had become healthier.
What are known as inflammatory markers such as C Reactive Protein (CRP) and Interleukin 6 (IL-6) which are linked to heart disease and diabetes, fell as well. The levels of Tryptophan which is a compound linked to heart protection also increased. Why sharing this information? It is because these findings suggest that healing of an infected tooth can lead to measurable improvements in how the body uses energy and fights disease. It is already known that oral infections like gum disease can worsen diabetes by raising blood sugar, so it is important that people who are suffering from diabetes should consider keeping their teeth and gums healthy. Once the infection is cleared, the body becomes more responsive to insulin and makes it easier to manage blood sugar. It is part of managing the disease.

To every rule, there is an exception. Not every diabetic patient can have root canal treatment done. Patients suffering from advanced gum disease with very loose teeth (grade 3 mobility) are not recommended for this procedure. It’s because such teeth lack adequate support, so they are prone to fall off later.
In addition, let me also take this opportunity to address some frequently asked questions about this procedure. Many people ask, “Does a root canal treatment hurt?” The answer is no. With modern local anesthesia, the procedure is painless. You might feel slight tenderness afterward but it fades quickly.
Another common question is, “Why not just remove the tooth?” Extraction may seem easier and provides immediate relief. However, it creates new long term problems such as chewing difficulty, bone loss and shifting of nearby teeth yet a root canal treatment saves your natural tooth which, I feel is always the best option.
People also wonder about cost. Root canals may seem costly initially but they are cheaper than replacing a lost tooth with say an implant later. Considering the long-term health benefits, they are well worth it.
What most people do not realize is that a neglected tooth can put strain on the heart and blood vessels just like poor diet or lack of exercise. Therefore, visiting the dentist regularly is not just about keeping your smile bright. It is also about protecting your life.
This is why the best way to avoid infection is prevention. Brush your teeth at least twice a day, floss daily and rinse with mouthwash to reduce bacteria. Visit your dentist at least twice a year for check-ups and cleaning.
If you feel sensitivity, pain or swelling in a tooth or gum, don’t wait. Early treatment can stop the infection before it spreads. Eat foods like fruits, vegetables that support both oral and body health. It is also important to cut back on the intake of sugary drinks, alcohol and use of tobacco and its products.
If you already have diabetes or high cholesterol, take special care of your mouth and adhere to the medications prescribed by your Doctor. Oral infections can make these conditions worse as stated already but good dental care can help stabilize them.
Lastly, after a root canal, follow your dentist’s instructions closely and attend your follow-up visits. This ensures full healing and long-term protection. Remember, a healthy mouth helps create a healthy system.

Source:
Zhang, Y. et al. (2025). Successful Endodontic Treatment Improves Glucose and Lipid Metabolism: A Longitudinal Metabolomic Study. Journal of Translational Medicine, 23(1195).