Yogurt is rich in the bacteria species Lactobacillus. Women with bacterial vaginosis have a vagina pH that is not where it should be, which allows the bacteria to grow and reproduce. However, once the yogurt makes contact with the tissues of the reproductive tract, the pH is changed and the correct bacteria are introduced. It will take awhile to colonize the entire reproductive tract so repeating the yogurt tampon home remedy may be essential to create the right environment so that pathogenic bacteria cannot grow.