Tooth plugging is generally referred to as tooth filling, and how many years the tooth can last after filling usually depends on both the patient and the doctor. For example, the location, depth and type of the cavity, but also depends on the filling material, the doctor’s skills and the patient’s own maintenance after the filling. Most people after filling, teeth can last for years or even decades. 1. Patient factors: such as the size, location, depth and type of dental caries cavity, the cavity is too large or too small will affect the service life of the filling. Too large, too deep cavity type, cavity edge of the healthy tooth tissue remaining less and resistance to decline and other factors, may cause the teeth to bite hard objects when the tooth splitting, resulting in filling loss. If the patient’s oral care is not in place, secondary caries will also occur, requiring re-filling. 2. Doctor’s factor: First of all, the doctor should fully assess the cavity situation and choose the appropriate filling material. If conditions permit, try to choose resin filling materials with good adhesion and hardness. In addition, the doctor needs to prepare the appropriate depth and shape of the cavity to avoid the formation of a thin-walled weak tip, taking into account both the need for resistance and retention needs.