Poor oral health and failure to have regular dental checks could increase the risk of mouth and throat cancer, according to a pan-European study. One of the partners of the study was the Leibniz Institute for Prevention Research and Epidemiology (BIPS) at the University of Bremen, Germany (Prof. Wolfgang Ahrens). It was coordinated by the International Agency for Research on Cancer.
The research also suggests – based on a small number of tumour patients – that excessive use of mouthwash may also cause this particular form of cancer. Excessive use is defined as more than three times a day.
It has been established for some time that smoking and heavy alcohol consumption, particularly in combination, are strongly related to mouth and throat cancers. Low socio-economic status is also recognised as a contributory factor. Now, however, a new study has identified new risk factors for upper aerodigestive tract cancer (cancer of the mouth, larynx, pharynx and esophagus).
The study of 1,962 patients with mouth and throat cancers, with a further 1,993 people used as comparison control subjects, was conducted in 13 centres across nine countries and supported by EU funding.
Prof. Wolfgang Ahrens, Deputy Director of the BIPS and professor of epidemiological research methods at the University of Bremen said: “These results are really important. Up until now, it was not really known if these dental risk factors were independent of the well known risks for mouth and throat cancers – smoking, alcohol and low socioeconomic status.”
The researchers were able to strip out the causation factors of smoking, alcohol and socio-economic factors, and still found there was a connection between poor oral health and increased risk of mouth and throat cancers.
The findings are highly “nuanced” and there is an interconnectedness of many of the risk factors, he stressed, but there was now evidence that poor oral health and poor dental care were also part of the picture.
The definition of poor oral health included people who had complete or part dentures, people with persistently bleeding gums.
“People should not assume that if they wear dentures and have none of their own teeth left, they have no need to see a dentist,” said Dr David Conway, Clinical Senior Lecturer at the University of Glasgow Dental School and one of the senior authors of the study. “On the contrary, even if you have got dentures, you should make sure you go for regular check-ups,” he said.
People with poor dental care were defined as those who hardly ever or never brushed their teeth or visited the dentist. The frequency of dental visits should be determined by a dentist’s risk assessment and if people fell into the low risk category it could be once a year or even every two years, said Dr Conway.
“It is not a case of ‘one size fits all’. Visits could be six-monthly, but certainly not five-yearly,” Dr. Conway added.
The possible role of mouthwash as a causative factor would require further research, said Professor Ahrens. There might be a relationship between excessive use of mouthwash and people who used it to mask the smell of smoking and alcohol. Nevertheless, the researchers found that “frequent use of mouthwashes (3-plus times per day) was associated with an elevated risk of developing mouth and throat cancer”, although they were unable to analyse the types of mouthwash used many years ago by participants in the study.
Dr Conway said: “I would not advise routine use of mouthwash, full stop. There are occasions and conditions for which a dentist could prescribe a mouthwash – it could be that a patient has a low salivary flow because of a particular condition or medicine they are taking. But for me, all that’s necessary in general is good regular brushing with a fluoride toothpaste and flossing combined with regular check-ups by a dentist.”
The research group, which includes collaborators from Germany, UK, Estonia, Switzerland, Greece, the Czech Republic, Italy, Norway, Spain, USA, Croatia, Ireland and France, has recently received a new tranche of funding from the EU and WHO’s International Agency for Research of Cancer, which will be used to research prognostic factors as well as risk factors.
Published online in Oral Oncology on 26th March 2014:
Title: "Oral health, dental care and mouthwash associated with upper aerodigestive tract cancer risk in Europe: the ARCAGE (Alcohol-Related Cancers and Genetic-susceptibility in Europe) study"
Contact in Germany:
University of Bremen
Faculty of Mathematics and Computer Science
Leibniz Institute for Prevention Research and Epidemiology - BIPS
Professor Dr Wolfgang Ahrens
Phone: +49 (0)421 218-56822
Mobile: +49 (0)172-408-8706
Meike Mossig | idw - Informationsdienst Wissenschaft
Research investigates whether solar events could trigger birth defects on Earth
21.07.2015 | University of Kansas
Accounting for short-lived forcers in carbon budgets
15.07.2015 | International Institute for Applied Systems Analysis (IIASA)
Researchers have developed an ultrafast light-emitting device that can flip on and off 90 billion times a second and could form the basis of optical computing.
Joint BioEnergy Institute study identifies bacterial protein that is key to protecting rice against bacterial blight
A bacterial signal that when recognized by rice plants enables the plants to resist a devastating blight disease has been identified by a multi-national team...
Researchers in the Cockrell School of Engineering at The University of Texas at Austin are one step closer to delivering smart windows with a new level of energy efficiency, engineering materials that allow windows to reveal light without transferring heat and, conversely, to block light while allowing heat transmission, as described in two new research papers.
By allowing indoor occupants to more precisely control the energy and sunlight passing through a window, the new materials could significantly reduce costs for...
Argonne scientists used Mira to identify and improve a new mechanism for eliminating friction, which fed into the development of a hybrid material that exhibited superlubricity at the macroscale for the first time. Argonne Leadership Computing Facility (ALCF) researchers helped enable the groundbreaking simulations by overcoming a performance bottleneck that doubled the speed of the team's code.
While reviewing the simulation results of a promising new lubricant material, Argonne researcher Sanket Deshmukh stumbled upon a phenomenon that had never been...
A NASA camera on the Deep Space Climate Observatory (DSCOVR) satellite has returned its first view of the entire sunlit side of Earth from one million miles away.
The color images of Earth from NASA's Earth Polychromatic Imaging Camera (EPIC) are generated by combining three separate images to create a...
23.07.2015 | Event News
10.07.2015 | Event News
25.06.2015 | Event News
29.07.2015 | Life Sciences
29.07.2015 | Earth Sciences
29.07.2015 | Life Sciences