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①乳牙滯留影響恒牙萌出;
②因齲壞過大或嚴重的牙周病經治療無效;
③因損傷、牙冠折裂而不能治療或修復;
④排列不齊的錯位牙、額外牙;
⑤阻生牙反復引起冠周炎或造成鄰牙齲病者;
⑥無對頜功能的牙,以及有礙義齒修復者;
⑦可疑為引起某些全身性疾病的病竈牙;
⑧因牙周病、牙齒過度鬆動,影響咀嚼功能者;
⑨引起嚴重炎症,如蜂窩組織炎,骨髓炎等的病原牙;
⑩腫瘤放射野中,以後可能成為致病牙者。
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