Porcelain dental restoration is a restoration method often applied when tooth loss occurs, under normal circumstances after wearing porcelain teeth is not any odor situation, once in wearing porcelain teeth after feeling a significant odor inside the mouth, and is porcelain teeth inside the occurrence, the only way is to replace the porcelain teeth. This situation has the following two causes: first, porcelain teeth itself metal on the body or the body of the metal allergy phenomenon, so that the metal causes allergic reactions to the oral mucosa, the need to replace the metal or all-porcelain teeth. Second, the porcelain teeth inside the tooth tissue occurred secondary decay, corruption, necrosis, in the porcelain teeth inside the formation of gaps, will have the smell of corruption, necrosis, with gaps in the mouth inside, must be timely porcelain teeth removed, the teeth inside to repair again after wearing porcelain teeth.