Although they don't last as long as permanent teeth, your child's first teeth play an important role in his development. While they're in place, these primary teeth help your little one speak, smile, and chew properly. They also hold space in the jaw for permanent teeth. If a child loses a tooth too early (due to damage or decay) nearby teeth may encroach on that space, which can result in crooked or misplaced permanent teeth. Also, your child's general health is affected by the oral health of the teeth and gums.