An exact answer to this question depends on several factors including the fetus age, the dentist’s diagnosis and patient’s condition. However, because of the potential harm of such rays for the fetus, the radiography must be avoided for the pregnant women as much as possible. In cases when radiography is necessary for a pregnant woman, dental radiography is suggested in the third trimester of pregnancy when the fetus organs are formed and the most dangerous time for radiography is the first trimester.