During the human gestation period, various systemic alterations occur in the mother secondary to endocrine changes. These changes, combined with the presence of the gravid uterus, result in conditions affecting the various systems of the mother which must be considered by the dentist.Fetal development is divided into three stages:1) The fertilization and implantation period 2) The embryonic period and 3) The fetal period.The second period characterized by organogenesis which taratogens may result in functional and morphogenic malformations.The ideal dental treatment schedule for the pregnant patient is twice during first trimester, at least once during second trimester and once during third trimester.The second trimester is an ideal time for performing dental treatment.Emergency problem should be alleviated immediately during pregnancy.Indicated medications should not be with held because of pregnancy but patients must be informed of benefits and risks.With careful attention to the special needs of the pregnant patient, the dentist can provide high quality dental care while minimizing potential risks to mother and fetus.Emphasis should be on preventive strategies and meticulous oral hygiene to manage common oral problems associated with pregnancy.