There is no definite answer to the question of how long a filling will last. This is because it is very closely related to the specific part of the tooth to be filled, the material used for the filling and the chewing habits of the patient. Just like the question of how long a building can stand, there is no 100% certain answer as it has to do with the condition of the foundation, the materials used for construction, and whether there are some serious geological disasters. Generally speaking, if the cavity is not too deep, the filling material lasts for a long time, and many patients’ cavities can last for a lifetime as long as there is no secondary caries after the repair. However, for some anterior incisal defects, plus the patient will have some action of biting hard objects, so this kind of defect is especially easy to fall off after repair, sometimes it may just be repaired, the patient will eat a meal of ribs, and then it will fall off, so there is no fixed time for the maintenance of the filling material.