If the treatment of the decaying tooth is neglected for too long and the problem reaches the jawbone from the root canals, severe inflammatory conditions may occur. The child’s face may swell and there may be severe pain. In this case, keeping the tooth in the mouth may present a danger to the health of the child and tooth extraction should be performed. In particular, if the tooth in question is a deciduous tooth and the permanent tooth’s time to erupt is close, there is no harm in tooth extraction. If there is a long period of time for the permanent tooth to erupt, the space of the tooth must be preserved by a space maintainer. Otherwise, the teeth next to space will move here, leaving no room for the permanent tooth. The result goes as far as disturbing the whole balance of the mouth.