What is a bad restoration? In the clinic, we often encounter patients with unscientific design, poor production process of the restorations in the mouth, and the oral tissues have caused different degrees of damage that is bad restorations. This is due to our country’s economic development is not balanced, oral restoration of uneven medical level, and many patients do not understand the common sense of oral restoration or greedy to save money or too much trouble and accept these restorations, perhaps it plays a certain chewing function, short-term harm to your health did not occur, but with the passage of time, the harm it will gradually reveal, mainly in the following areas: 1, cause teeth loose: Dentures if the design is not reasonable, such as not dispersed occlusal force, will cause the oral cavity to play a role in fixing the natural teeth load force is too large or or stress concentration, more than its own compensatory potential, will rapidly cause alveolar bone resorption, resulting in tooth loosening. 2, causing neighboring teeth caries: bad restorations filling body and neighboring teeth between the existence of a small gap, easy to hide food, and can not be removed in a timely manner, is the best place for bacterial growth, reproduction, such as the timely removal of the neighboring teeth will soon cause caries. 3, inflammation of the gums: the edge or surface of the poor restorations are often very rough, easy to retain physical debris, conducive to the accumulation of bacteria, reproduction, long-term stimulation of the gums, easy to cause chronic inflammation of the gums. The main symptoms are bleeding gums, swelling, mucosal ulceration, oral odor, and even can not bite food. Special attention should be paid to the long-term stimulation of oral tissues by bad restorations, which may also cause cancerous changes in the oral mucosa. 4, cause temporomandibular joint disorder symptoms: most of the bad restorations have poor occlusal relationship, some even have no occlusal contact or only partial occlusal contact. Long-term unbalanced occlusal state of the oral cavity will cause temporomandibular joint popping, pain and other symptoms such as not timely improved and corrected, can further cause irreversible damage to the temporomandibular joint. 5, affect the aesthetics: poor restorations of color, shape and natural teeth often have a big difference in coordination, denture assembly instead of destroying the harmony of the oral aesthetics. Some bad restorations are made of self-coagulating plastic, which can be easily discolored or stained, making the dentures yellow and black, affecting the aesthetics. To summarize, we can see that there are many hazards of bad restorations, such as wearing bad restorations in the mouth should be removed as soon as possible. At the same time, patients with missing teeth should not be too much trouble or greedy for cheap and damage the oral cavity or even the health of the whole body.