Serious infections benefit to prostaglandin and tumor necrosis factor-stimulated chemicals like labor - added, leading to preterm birth. The researchers evaluated 366 pregnant women with periodontitis - a as serious infections beneficial.

The subjects were divided into 3 groups. Feet and the surface of the first tooth is cleaned to remove plaque and bacteria, the second group of antibiotics, the third group combined cleaning and antibiotics, the fourth group was cleaning the plaque and oral placebo.

The results showed that the risk of preterm delivery fell 84% in the oral treatment group before the 35th week of pregnancy. This risk is not reduced in those taking antibiotics.

Women are taking antibiotics after cleaning the plaque and bacteria that the preterm birth rate higher than the fourth group. Professor Marjorie Jeffcoat, who led the study, said: "The results showed that oral hygiene can significantly reduce the risk of preterm birth."

The researchers recommend that all women planning to have children or pregnant women seek medical and dental treatment (if any). For pregnant women are diagnosed with the disease, it is best to clean the plaque at the base and the tooth surface from the 3rd month of pregnancy to the 6th month pregnancy. They said that should continue to conduct research to determine the reasons why antibiotics after cleaning the plaque is not effective.