There are mainly the following treatments for yellowing baby teeth: 1. Plaque builds up on the surface of the teeth, the plaque is colored, but the surface of the teeth is smooth and without holes, these yellow things can be removed with a toothbrush or a probe. In this case, you need to do scaling i.e. a thorough cleaning of the teeth to remove the plaque; 2. If tooth decay has occurred, the surface of the teeth is not smooth and there may be holes, you need to remove the eroded tooth tissue cleanly and then use special dental materials to fill the holes i.e. fill the teeth.