Phase I treatment, also known as early intervention, refers to orthodontic treatment that’s given before a child has all of their permanent, or adult, teeth. This treatment usually occurs between ages 7 and 10 and is designed to fix problems that are easily corrected at a young age. Dr. Herberger will consider early treatment when a skeletal problem exists and a longer treatment is needed to influence a patient’s growth to help improve the underlying skeletal problem.