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Science of Vaginal Hygiene The vagina has a natural protective layer which is acidic in nature, to help prevent infection. This layer is maintained when good bacteria called lactobacilli produce Lactic acid (or milk acid), which maintains the acidic environment at a pH value of 3.5 to 4.5. This promotes the growth of lactobacilli, inhibiting the presence of harmful bacteria and preventing infection. Therefore, the vagina takes care of itself by continuously producing secretions to provide lubrication, cleanse and maintain its proper acidity to prevent infection. Any imbalance in the pH range of vagina causes the change in acidic environment (pH 3.5 to 4.5), which in turn reduces the growth of good bacteria and thus resulting in the attack from bad bacteria. This then increases the risk of getting any form of vaginal infections.