It is possible. Perfectly aligned baby teeth often do not leave adequate room for the larger permanent teeth to erupt. As such, their permanent teeth may need to adjust to fit. Using a HealthyStart appliance can help ensure that your child's teeth come in straight while naturally expanding the arch. Additionally, when the teeth grow in straight, the fiber bundles anchoring them to the mouth will leave little room for relapse — meaning the teeth will likely stay straight throughout adulthood.