Saliva is versatile and complex fluid and is necessary for various physiological functions in the oral cavity.Female sex hormones (estrogen, progesterone & human gonadotropin) are secreted primarily by the placenta and are responsible for most of the physiologic changes during pregnancy.Pregnancy increases the propensity to gingival inflammation known as pregnancy gingivitis with an enhanced gingival bleeding tendency without specific plaque association, periodontal pocket formation and also increased dental caries incidence.The book sheds light on the reason for the above mentioned dental disorders during the pregnancy.