Baby teeth are whiter than adult teeth, but as the child grows, they lose their baby teeth, and adult teeth start to grow. However, the teeth may look yellow when your child's complete set of permanent teeth appears. According to the American Academy of Pediatrics, it is normal for permanent teeth to be less white than baby teeth. If the discoloration persists, it is time to get urgent dental care . The factors can be external and internal, but you need to consult the pediatrics before it's too late. Causes of Yellow Teeth in Kids Many signs of discoloration may appear externally and internally in your kid. The external discoloration is temporary, but the internal discoloration is a matter of concern. It occurs due to medical conditions like black stains due to trauma, brown stains because of injury, white stains that are a sign of tooth decay, and orange color may appear because of bacteria build-up and poor oral hygiene. A few of the other causes of yellow teeth are: Plaqu...