Why do women get more cavities than men?

Reproduction pressures and rising fertility explain why women suffered a more rapid decline in dental health than did men as humans transitioned from hunter-and-gatherers to farmers and more sedentary pursuits, says a University of Oregon anthropologist.

The conclusion follows a comprehensive review of records of the frequencies of dental cavities in both prehistoric and living human populations from research done around the world. A driving factor was dramatic changes in female-specific hormones, reports John R. Lukacs, a professor of anthropology who specializes in dental, skeletal and nutritional issues.

His conclusions are outlined in the October issue of Current Anthropology. The study examined the frequency of dental caries (cavities) by sex to show that women typically experience poorer dental health than men. Among research reviewed were studies previously done by Lukacs. Two clinical dental studies published this year (one done in the Philippines, the other in Guatemala) and cited in the paper, Lukacs said, point to the same conclusions and "may provide the mechanism through which the biological differences are mediated."

A change in food production by agrarian societies has been associated with an increase in cavities. Anthropologists have attributed men-women differences to behavioral factors, including a sexual division of labor and dietary preferences. However, Lukacs said, clinical and epidemiological literature from varied ecological and cultural settings reveals a clear picture of the impacts on women's oral health.

"The role of female-specific factors has been denied by anthropologists, yet they attain considerable importance in the model proposed here, because the adoption of agriculture is associated with increased sedentism and fertility," Lukacs said. "I argue that the rise of agriculture increased demands on women's reproductive systems, contributing to an increase in fertility that intensified the negative impact of dietary change on women's oral health. The combined impacts of increased fertility, dietary changes and division of labor during the move into agricultural societies contributed to the widespread gender differential observed in dental caries rates today."

Lukacs' meta-analysis looked at both prehistoric anthropological and modern health records. He repeatedly found that increases in cavities go in favor of women in adulthood. Lukacs' review found that women's higher rates of cavities are influenced by three main changes:

Female sex hormones. Citing his own research published in 2006, he notes that these hormones and associated physiological factors can significantly impact cavity formation. A study on animals published in 1954 found that female estrogens, but not male androgens, were correlated to cavity rates. He argues for a cumulative effect of estrogens, including fluctuations at puberty and high levels during pregnancy that both promote cavities and dietary changes.

The biochemical composition and flow rate of saliva. Women produce less saliva than do men, reducing the removal of food residue from the teeth, and that during pregnancies the chemical composition changes, reducing saliva's antimicrobial capacity.

Food cravings, immune response and aversions during pregnancy. Lukacs points to findings that women crave high-energy, sweet foods during the third trimester, as well as an aversion to meat in first trimesters.

How the factors combine to contribute to higher risk of cavities in women as they age is not fully documented or understood, he wrote. "However, if hormonal and physiological factors work in an independent or additive manner, their impact on women's oral health could be significant. The fact that women's caries experience increases with age at a greater rate than men's in diverse ethnic groups from different ecological and cultural settings supports this interpretation."

Saliva proteins could help detection of oral cancer

Clinicians could detect oral squamous cell carcinoma, a form of oral cancer, using a simple test that detects proteins in saliva, according to a report in the October 1, 2008, issue of Clinical Cancer Research, a journal of the American Association for Cancer Research. This work was led by David T. Wong, D.M.D., D.M.Sc., professor and associate dean for research, at the University of California, Los Angeles School of Dentistry.

Previous studies have shown that saliva can be a useful diagnostic tool, but this is the first study to globally evaluate saliva protein levels from oral cancer patients. Since it is very simple to collect and process saliva fluids, the discovery of these biomarkers may lead to a useful clinical tool for noninvasive diagnosis of oral cancer in the future.

"This test is currently not available, but we are developing point-of-care microfluidic devices to detect these markers that we can use in clinical trials," said Shen Hu, Ph.D., assistant professor of Oral Biology and Proteomics at the University of California, Los Angeles School of Dentistry.

Wong, Hu and colleagues have been working as part of the National Institute of Dental and Craniofacial Research (NIDCR)'s Human Saliva Proteome Project, which focuses on identifying and cataloguing the proteomic components of saliva in healthy subjects. This work, also supported by NIDCR, demonstrates the first translational utility of the salivary proteome for oral cancer detection.

Researchers collected saliva samples from 64 patients with oral squamous cell carcinoma and 64 healthy patients.

Five candidate biomarkers were successfully validated using immunoassays: M2BP, MRP14, CD59, profilin and catalase.

The presence of these biomarkers confirmed the presence of oral cancer 93 percent of the time.

"I believe a test measuring these biomarkers will come to a point of regular use in the future," Hu said. "We have demonstrated a new approach for cancer biomarker discovery using saliva proteomics."