If your child’s teeth are yellow and cannot be brushed clean, you can choose methods such as scaling, sandblasting, polishing, etc., to clean the pigment on the surface of the teeth and restore the whiteness of the teeth. 1. Cleaning: such as sonic cleaning, etc., can be attached to the surface of the teeth to clean up the calculus, so that the teeth back to clean. 2. Sandblasting: can be used after cleaning, mainly using high-pressure impact, the surface of the teeth plaque, pigmentation deposits and the remaining fragments of calculus clean, so that the teeth are cleaner and smoother. 3. Polishing: After cleaning and sandblasting, you need to use the polishing method to clean the teeth, so that the surface of the teeth become cleaner, smoother and flatter. Usually also pay attention to oral hygiene, adhere to morning and evening brushing, rinsing after meals, to prevent food residues in the mouth will breed bacteria, resulting in changes in tooth color or the formation of dental caries.