Regardless of age, fillings are done in the same way, with the steps of decay removal, cavity cleaning, filling, bite adjustment and polishing. 1. Decay: Caries or congenital developmental abnormalities of the teeth caused by dental defects, before filling the teeth need to use a special instrument to grind away the cavity corruption of the soft tooth tissue, to prevent the presence of bacteria in the future secondary caries. 2. Cleaning the cavity: After cleaning the cavity, use alcohol cotton balls or water to sterilize the cavity. 3. Filling: After cleaning, the cavity is usually filled with resin or glass ionomer, then sculpted and cured. 4. Adjustment of occlusion and polishing: use occlusal paper to check the filling site has occlusal high points, and then adjust the jaw rubber wheel polishing surface. If the cavity is too deep according to the teeth, may also need medication cushion or root canal treatment, specific need to go to the hospital to check the teeth.