Tooth decay and gum disease are among the most common health problems in the world.
Almost everyone will experience at least one cavity during their lifetime, and many adults will develop some degree of gum disease as they get older.
Although these conditions are very common, they should not be considered a normal part of aging. If left untreated, they can cause pain, infections, difficulty eating, tooth loss, and a lower quality of life.
Research has also linked poor oral health to other health problems, including heart disease, diabetes, and some pregnancy complications.
Dentists have long known that daily habits play a major role in protecting teeth and gums. Brushing twice a day with fluoride toothpaste, flossing, eating less sugar, visiting the dentist regularly, and avoiding smoking all help reduce the risk of dental disease.
However, many people notice that some individuals seem to develop cavities easily despite taking good care of their teeth, while others have few dental problems even with less-than-perfect habits.
This has led scientists to wonder whether genetics also plays an important role.
A major new study led by researchers at Umeå University in Sweden provides strong evidence that the answer is yes. The researchers found that a person’s genes, together with lifestyle factors such as body weight, education, smoking, and even personality, can influence the risk of developing tooth decay and gum disease.
To better understand this connection, the research team combined information from nine clinical studies involving around 62,000 people.
They also analyzed data from the UK Biobank, a large health research project containing information from about 461,000 participants who had reported details about their dental health. By bringing together such a large amount of information, the scientists were able to perform the biggest genetic study ever carried out on common dental diseases.
The researchers examined millions of locations across the human genome to identify genetic differences linked to oral health.
Their analysis uncovered 47 previously unknown genes associated with tooth decay. They also confirmed the importance of a gene involved in the immune system that increases the risk of gum disease, also known as periodontitis.
These discoveries help explain why people do not all have the same natural risk of developing dental problems. Some of the newly identified genes help guide the development of teeth and jaw bones. Others influence how saliva is produced or how well it protects the teeth. Saliva is one of the body’s natural defenses because it washes away food particles, neutralizes harmful acids, and helps repair tiny areas of damage on tooth enamel. If saliva does not work as well as it should, cavities may develop more easily.
Other genes appear to influence the types of bacteria that live naturally inside the mouth. Everyone carries billions of bacteria, and many are harmless or even helpful. However, some bacteria produce acids that damage tooth enamel and increase the risk of cavities. A person’s genes may partly shape which bacteria become more common in their mouth.
The study also showed that the immune system plays an important role in gum disease. Gum disease begins when bacteria build up around the teeth and trigger inflammation in the gums. The body’s immune system tries to fight the infection, but if the response becomes too strong or continues for too long, it can damage the gums and the bone supporting the teeth. This can eventually cause teeth to loosen or fall out.
The researchers also discovered links between tooth decay and several well-known risk factors for heart disease, including smoking and obesity. This finding adds to growing evidence that oral health and general health are closely connected. Looking after the teeth and gums may benefit more than just the mouth, while improving overall health may also reduce the risk of dental disease.
Although the study highlights the importance of genetics, the researchers stress that genes are only one part of the picture. Healthy daily habits remain the most effective way to prevent cavities and gum disease. Brushing twice each day with fluoride toothpaste, flossing regularly, eating a balanced diet with less sugary food and drinks, avoiding tobacco, and visiting the dentist for regular check-ups continue to be the best ways to protect oral health.
The findings may eventually help doctors and dentists identify people who are naturally at higher risk of dental disease. In the future, this could lead to more personalized prevention plans, earlier treatment, or even new medicines that target the biological pathways involved in tooth decay and gum disease.
The study was led by Professor Ingegerd Johansson and her colleagues at Umeå University and was published in the journal Nature Communications.
By identifying dozens of new genes linked to common dental diseases, the research provides scientists with valuable clues about why some people are more vulnerable than others. It also reinforces an important message: good oral health depends on both healthy habits and the unique biology each person is born with.
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.
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