How the health of your mouth affects your liver

Dentists using intraoral 3D camera to create image for ceramic tooth reconstruction

A new large-scale British study has found that poor oral health may be linked to an increased risk of liver cancer, building on previous research that has also linked oral health to a range of diseases.

Carried out by researchers at Queen’s University Belfast in the United Kingdom, the new study looked at data on 475,766 people taken from the UK Biobank.

The Biobank is a large long-term study that includes genomic data on more than half a million British residents, as well as data on brain imaging, their general health and medical information.

The researchers set out to investigate the association between oral health, using patients’ self-reports on conditions such as painful or bleeding gums, mouth ulcers and loose teeth, and the risk of a number of gastrointestinal cancers, including liver, colon, rectum and pancreatic cancer.

The findings, published in the United European Gastroenterology Journal, showed that although there appeared to be no significant association between oral health and the risk of most of the gastrointestinal cancers included in the study, a strong link was found for hepatobiliary (liver) cancer.

The team also found that participants with poor oral health were more likely to be younger, female, living in deprived socioeconomic areas, and consumed less than two portions of fruit and vegetables per day.

“Poor oral health has been associated with the risk of several chronic diseases, such as heart disease, stroke and diabetes,” says study lead author Dr Haydée WT Jordão.

“However, there is inconsistent evidence on the association between poor oral health and specific types of gastrointestinal cancers, which is what our research aimed to examine.”

Although it is still unclear how poor oral health may be associated with liver cancer, rather than other digestive cancers, one explanation is that the oral and gut microbiome may play a role in the development of the disease.

“The liver contributes to the elimination of bacteria from the human body,” explains Dr Jordão.

“When the liver is affected by diseases such as hepatitis, cirrhosis or cancer, its function will decline and bacteria will survive for longer, and therefore, have the potential to cause more harm.

“One bacteria, Fusobacterium nucleatum, originates in the oral cavity, but its role in liver cancer is unclear.

“Further studies investigating the gut microbiome and liver cancer are therefore warranted.”

The findings are not the first time oral health has been linked to a higher risk of cancer; an American study published back in 2017 also found that women who have a history of gum disease may have a higher risk of several types of cancer, particularly tumours in the oesophagus and breasts.
AFP Relaxnews

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