Early Orthodontic Treatment: Phase 1 Orthodontics for Children Ages 7 to 10

Why Age 7?

The American Association of Orthodontists recommends an initial orthodontic evaluation by age 7. By this age, enough permanent teeth have erupted (typically the first molars and incisors) for an orthodontist to identify developing problems. The jaw bones are still growing and can be influenced by orthopedic forces from appliances like expanders. After growth is complete, typically in the mid-teen years, skeletal corrections often require surgery rather than appliances.

Posterior Crossbite

A posterior crossbite occurs when the upper jaw is narrower than the lower jaw, causing some upper back teeth to bite inside the lower back teeth instead of outside them. This is one of the most common reasons for Phase 1 treatment. If left uncorrected during growth, a crossbite can cause asymmetric jaw development and may require surgical correction later. A palatal expander can widen the upper jaw during childhood when the midpalatal suture has not yet fused.

Severe Crowding or Space Loss

When baby teeth are lost early due to decay or injury, neighboring teeth can drift into the gap and block the permanent tooth from erupting properly. Space maintainers or limited braces can hold or create space so permanent teeth have room to come in. Severe crowding of the erupting permanent teeth may also benefit from early expansion to reduce the likelihood of needing tooth extractions later.

Protruding Upper Front Teeth

Children with significantly protruding upper front teeth (excessive overjet) face a higher risk of dental trauma from falls or sports injuries. Studies show that children with an overjet of more than 3 to 4 millimeters are twice as likely to injure their front teeth. Phase 1 treatment can reduce the protrusion and lower this risk during the active, accident-prone childhood years.

Underbite (Class III Malocclusion)

An underbite occurs when the lower jaw and teeth sit in front of the upper jaw and teeth. If the underbite is caused by the upper jaw being too small (rather than the lower jaw being too large), early treatment with a face mask or reverse-pull headgear can stimulate forward growth of the upper jaw while the child is still growing. This approach becomes less effective after about age 10 to 12.

Harmful Oral Habits

Persistent thumb sucking, tongue thrusting, or mouth breathing can alter jaw growth and tooth position. Phase 1 treatment may include habit-breaking appliances such as a tongue crib or palatal crib along with correction of the dental changes the habit has caused, such as an open bite or narrow palate.

The Orthodontic Evaluation

The orthodontist will take dental X-rays (panoramic and cephalometric), photographs, and dental impressions or digital scans of the teeth. These records help the orthodontist evaluate the positions of erupted and developing teeth, the size and shape of the jaws, and the overall growth pattern. The orthodontist will then discuss findings, whether Phase 1 treatment is recommended, the proposed treatment plan, estimated timeline, and costs.

Common Phase 1 Appliances

The specific appliance depends on the problem being addressed. A palatal expander is the most commonly used Phase 1 appliance. It attaches to the upper back teeth and applies gradual outward pressure to widen the upper jaw. The parent turns a small screw in the appliance daily for a prescribed period (usually 2 to 4 weeks), then the expander stays in place for several months to stabilize the expansion.

Partial braces may be placed on the permanent teeth that have already erupted to align them or close gaps. A face mask (reverse-pull headgear) is used to address underbites by pulling the upper jaw forward. It is worn at home, typically for 12 to 14 hours per day, including during sleep. Space maintainers hold open the space left by prematurely lost baby teeth. Habit appliances like a tongue crib discourage thumb sucking or tongue thrusting.

How Long Phase 1 Takes

Active Phase 1 treatment typically lasts 6 to 18 months depending on the complexity of the problem. After the active phase, the appliance may remain in place for several additional months as a retainer. The orthodontist will then remove the appliance and begin a monitoring period, seeing the child every 6 to 12 months to track the eruption of remaining permanent teeth.

The Monitoring (Resting) Phase

After Phase 1 appliances are removed, there is a resting period of 1 to 3 years while the remaining permanent teeth erupt. During this time, the orthodontist monitors the child at regular intervals. A retainer may be worn to maintain the corrections achieved. The teeth may shift somewhat during this period, which is expected and does not necessarily mean Phase 1 failed.

Phase 2 Treatment

Most children who undergo Phase 1 treatment still need Phase 2 treatment once all or most permanent teeth have erupted, typically between ages 11 and 14. Phase 2 involves full braces or clear aligners to fine-tune tooth alignment and bite. Because Phase 1 has already addressed the underlying skeletal or spacing issue, Phase 2 treatment may be shorter or less complex than it would have been without early intervention.

Some orthodontists offer a reduced fee for Phase 2 if Phase 1 was completed in their office. Ask about the combined cost of both phases during the initial consultation.

Long-Term Retention

After Phase 2 is complete, the child will wear a retainer to maintain the final tooth positions. Retainer wear is typically full-time for the first few months, then nighttime only. Many orthodontists recommend long-term or permanent retainer use to prevent relapse. A bonded (fixed) retainer behind the front teeth is a common option for permanent retention.

Typical Cost Ranges

Phase 1 orthodontic treatment generally costs $1,500 to $3,500. This usually includes the initial records (X-rays, photos, impressions), the appliance(s), all adjustment visits during the active treatment phase, and a retainer. A palatal expander alone typically falls at the lower end of this range. Cases requiring multiple appliances or partial braces trend toward the higher end.

Phase 2 treatment (full braces or aligners) typically costs $3,000 to $7,000 as a separate fee. Some orthodontists offer a combined Phase 1 and Phase 2 fee that is lower than paying for each phase individually. Ask about total treatment costs upfront.

Payment Plans and Insurance

Most orthodontists offer interest-free monthly payment plans that spread the cost over the treatment period. Dental insurance plans with orthodontic benefits typically cover 50% of treatment up to a lifetime maximum of $1,000 to $2,000. The lifetime maximum applies to all orthodontic treatment combined, so using part of it for Phase 1 leaves less available for Phase 2.

Flexible spending accounts (FSAs) and health savings accounts (HSAs) can be used for orthodontic expenses. Medicaid coverage for orthodontic treatment varies by state and typically requires documentation that the condition causes a functional problem, not just a cosmetic concern.