Phase I treatment, or early interceptive treatment, focuses primarily on specific teeth concerns or jaw growth problems. This often includes unusually late erupting teeth, cross-bites, large overbites, underbites or a narrow upper jaw. Thumb sucking or tongue habit correction is another area of phase I treatment since it often leads to problems with the teeth and jaws. Treatment of these types of issues are most successful when performed before age 10.
Phase II treatment is more comprehensive and focuses primarily on all the teeth in both jaws. Once the jaw growth issues are corrected, a beautiful, healthy smile can be created that functions ideally. Successful Phase I treatment often leads to simpler Phase II treatment. Sometimes, Phase II treatment may even be avoided.