The entire process of filling a tooth can be divided into five steps, which can be summarized as removal, preparation, filling, adjusting and polishing. 1. Removal: The first step of filling is to remove all carious bad tissues and bacteria, which is usually done by using a dental drill. 2. Preparation: This refers to the preparation of the cavity walls, margins and corners after removing the bad tissues of caries. The main purpose is to protect the pulp and healthy tooth tissues, and at the same time establish a better resistance and retention shape. If the preparation is not strict, the filling material may be dislodged or not close. 3. Filling: After the cavity has been sterilized, the filling process begins. The filling material prepared in advance will be filled into the prepared cavity, adjusting the shape and tightness of the material, and finally curing with blue light. 4. Sharpening: Generally, after the filling is completed, the surface of the tooth will have a slight bump, generally use the bite paper to determine the high point of the bite, and then use the dental handpiece to grind away the bumpy parts, is the surface of the tooth is flat. 5. Polishing: After the adjustment and grinding is completed, the surface of the filled tooth is usually polished for aesthetic purposes. As the filling materials used are different, the follow-up care needs to pay attention to different matters, so after filling the teeth, we recommend that patients follow the doctor’s instructions for care.