When adult teeth come in on a 5, 6, or 7 year old, they will look more yellow than baby teeth. Healthy baby teeth are typically bright white whereas healthy adult teeth are ever so slightly yellow. When you compare baby teeth to adult teeth, the adult teeth will always look yellow, and that is normal. Not much can be done about it at this age, so Dr. Schafer rarely recommends whitening except in very badly stained teeth. Dr. Schafer usually has no problems with offering whitening to teenage patients, on the other hand. Often teens want whitening for the same reason that adults do: to have prettier looking teeth.