Dental bridges are medically known as fixed bridges or fixed dentures, and fixed bridges can theoretically last 15 to 20 years or even longer. However, how long it will last is determined by the condition of the abutment teeth, periodontal condition, quality of the fixed bridge and many other factors. 1. Abutment conditions: the physiological foundation of fixed bridges is the abutment teeth, which will bring extra burden to the abutment teeth. When], the long-term overload of the abutment teeth exceeds the physiological range, it will cause abutment tooth lesions, such as abutment tooth pain, abutment tooth gingivitis, abutment tooth loosening or displacement, thus affecting the service life of the fixed bridge. 2. Periodontal condition: when fixed bridge is used to repair dental defects, the denture is in contact with the surface mucosa of alveolar ridge. The alveolar bone ridge will be resorbed and deformed after a long time, so that there is a gap between the fixed bridge body and the alveolar ridge, which will cause periodontal inflammation due to embedded food, and affect the service life of the fixed bridge. 3. Fixed bridge quality: due to the production process of fixed bridge, poor quality or materials do not meet the requirements, will cause the bridge porcelain tooth surface fracture, fixed bridge occlusal surface wear through, etc., affecting the service life of the fixed bridge. If discomfort occurs during the use of fixed bridge, you should consult the doctor in time, improve the examination, and standardize the treatment under the guidance of professional doctors, in order to prolong the service life of fixed bridge as much as possible.