Even though the baby teeth are replaced by their permanent successors within a few years, early loss of baby molars can lead to teeth drifting into the space causing crowding and the need for costly orthodontic treatment. It is therefore important to avoid extraction of these molars by placing fillings to stop the progress of any tooth decay. An untreated cavity in a baby tooth can lead to a painful abscess requiring an emergency extraction which may be distressing for a small child.