How long a filling can last is influenced by various factors such as the location of the tooth, the materials used, the habits of the user and oral hygiene. Due to the difference in strength and elasticity between the filling material and the tooth itself, it is generally not advisable for the filling material to withstand excessive biting force. If too much force is applied, tiny cracks may be produced in the filled area, thus shortening the service life. Therefore, for different locations of teeth, the doctor will choose the appropriate filling material to achieve both aesthetic and long-term use. Patients should practice good oral hygiene and be careful not to bite into hard foods with their fillings to prolong their service life. If you find blackening around the filling material, blockage or painful discomfort around the filled tooth, it is recommended to go to the dentistry department of the hospital as soon as possible and re-treat if necessary to avoid bacteria from “hiding” under the filled tooth and destroying the deeper dental tissue. In the process of daily oral care, we should observe the health condition of the teeth, once there are black spots, wormholes and other conditions, you need to go to the hospital dentistry for treatment as soon as possible.