No, dental fillings do not cause miscarriage. Dental fillings are used to repair and restore a tooth that has been damaged due to decay or trauma. The filling material is placed into the cavity and then hardened with strong light or chemical reactions in order to create a secure bond between the filling material and the remaining tooth structure. While there have been some studies linking certain types of dental materials (such as amalgam) to an increased risk for adverse health outcomes, none of these studies demonstrate any direct link between dental fillings and miscarriages. Furthermore, pregnant women can safely receive routine dental care including having their cavities filled without fear of causing harm to their developing fetus.