Eating yogurt and other foods laden with lactic acid may keep your gums from receding and teeth from falling out, Japanese researchers report.

Dr. Yoshihiro Shimazaki and colleagues found that consuming yogurt and lactic acid drinks was significantly associated with better periodontal health.

"But, milk and cheese were not," Shimazaki said.

Periodontal disease is a chronic bacterial condition associated with receding gums and tooth loss in adults. Outside of regular brushing and flossing, effective measures to allay this disease are limited, Shimazaki, of Kyushu University in Fukuoka, Japan, and colleagues note in the Journal of Periodontology.

Previous research identified a lower occurrence of periodontal disease among people who eat high amounts of dairy products, but did not identify which dairy products were most beneficial, the researchers report.

Shimazaki's team assessed the severity of periodontal disease in 942 men and women, aged 40 to 79 years, and their intake of milk, cheese, and lactic acid foods.

They found that people with generalized (more advanced) periodontal disease had a lower intake of lactic acid foods than people with localized (less advanced) periodontal disease.

Compared with individuals reporting no lactic acid food intake, those eating 55 grams or more of yogurt (half an 6-ounce carton) or lactic acid drinks a day had significantly fewer markers of severe periodontal disease. The investigators made allowances for factors such as age, gender, smoking, alcohol intake, frequency of tooth brushing, blood sugar and cholesterol levels.

(Agencies via Xinhua News Agency February 28, 2008)