Even though these primary teeth are called “baby teeth”, some of them must serve until the child is at least twelve years old, sometimes longer. Neglect of the baby teeth can result in pain, infection of the gums and jaws, impairment of general health, and premature loss of teeth, which is a major cause of orthodontic problems. Also, cavities tend to form in teeth that are next to other teeth with unfilled cavities, because decay is really an infection and will spread if left untreated. It is unwise to leave active decay in the mouth. Decay on baby teeth can cause decay on permanent teeth. Unfortunately, most children with untreated decay on baby teeth will develop decay on permanent teeth.