Filling materials that can be used instead of amalgam include glass-ionomer cement, composite resins, as well as gold or porcelain. However, amalgam fillings last longer than glass-ionomer fillings and composite resins; they also cost less than gold or porcelain fillings. Moreover, there are no extensive studies to prove the safety of the aforementioned alternative materials during pregnancy, compared to amalgam fillings. Furthermore, based on studies in animals, bisphenol-A, a component found in composite resin fillings, has been proven to cause endocrine disruptions