What This Guide Covers and Who It Is For
This guide explains Phase 1 orthodontic treatment for children between the ages of 7 and 10. It covers what the treatment involves, which problems it corrects, what appliances are used, and what parents can expect in terms of cost and timeline.
Phase 1 orthodontics, sometimes called interceptive orthodontics, is a limited course of treatment performed while a child still has a mix of baby teeth and permanent teeth. This stage is known as the mixed dentition. The goal is to address skeletal or dental problems early, when a child's jaw bones are still growing and more responsive to orthodontic forces.
This guide is for parents who have been told their child may benefit from early treatment, or who want to understand what an orthodontist looks for at a first evaluation. It is also useful for parents who want to understand the difference between Phase 1 treatment and the full braces most teens receive. If your child has specific dental health needs, a the pediatric-dentistry page can help you find the right specialist.
Core Facts About Phase 1 Orthodontic Treatment
Phase 1 treatment corrects jaw growth imbalances, bite problems, and crowding during a window when the skeleton is most adaptable. Understanding the goals and limits of early treatment helps parents make informed decisions.
Why Age 7 Is the Recommended Evaluation Age
By age 7, most children have their first permanent molars and at least some permanent incisors. These teeth give an orthodontist enough information to evaluate bite alignment, jaw width, crowding, and growth direction.
The American Association of Orthodontists (AAO) recommends that every child receive an orthodontic screening by age 7. The American Academy of Pediatric Dentistry (AAPD) supports early identification of developing malocclusion (misalignment of the teeth or jaws) so that treatment can begin at the most effective time. [2] An evaluation at this age does not mean treatment will start right away. In many cases, the orthodontist will simply monitor growth and recommend returning for periodic check-ups.
Early evaluation is especially valuable when a child has a crossbite (upper teeth fitting inside the lower teeth), a significant overbite or underbite, visible crowding, or a thumb-sucking habit that has persisted past age 5. These problems are often easier to address before the jaw bones have finished growing.
What Phase 1 Treatment Addresses
Phase 1 targets structural problems that benefit from early intervention. The most common conditions include posterior crossbites, narrow upper jaws, severe crowding that blocks permanent teeth from erupting, protruding upper incisors at risk of injury, and underbites caused by skeletal discrepancy.
A Cochrane systematic review examined whether early treatment of Class II malocclusion (where the upper jaw and teeth are positioned ahead of the lower) produced lasting benefits. The review, which included trials with a combined total of over 700 participants, found that providing a first phase of treatment with functional appliances in children around ages 7 to 11, followed by a second phase in adolescence, did not produce significantly different final skeletal or dental outcomes compared to a single phase of treatment started in adolescence. However, the review did find that early treatment significantly reduced the risk of trauma (damage) to protruding upper front teeth during childhood. [1] This is an important set of findings. For many children with prominent upper front teeth who are not at elevated risk of dental trauma, waiting for a single phase of full braces may be equally effective. But when upper incisors stick out noticeably, early treatment can protect those teeth from injury during the years before full braces would begin.
Specific conditions such as crossbites, impacted teeth, and severe skeletal discrepancies are generally considered appropriate for early intervention regardless of trauma risk. The clinical decision depends on the individual child's growth pattern, the severity of the problem, and whether delaying treatment could lead to complications like tooth damage or asymmetric jaw growth.
Common Phase 1 Appliances
Several types of appliances are used in Phase 1, depending on the problem being treated. Each works differently and is selected based on the child's diagnosis.
A palatal expander is one of the most frequently prescribed Phase 1 appliances. It fits across the roof of the mouth and gradually widens the upper jaw. This is effective because the midpalatal suture (the growth plate in the center of the palate) has not yet fused in young children. Expansion creates space for crowded teeth and corrects posterior crossbites.
Partial braces, sometimes called limited braces, are brackets placed on a few permanent teeth, usually the front incisors and first molars. They align erupting permanent teeth and close gaps. Space maintainers hold open the space left by a prematurely lost baby tooth so the permanent tooth can erupt in the correct position. Habit-breaking appliances, such as a tongue crib or palatal rake, discourage thumb-sucking or tongue-thrusting habits that can distort jaw development.
In some cases, a reverse-pull headgear (also called a facemask) is used to encourage forward growth of the upper jaw in children with underbites. This type of appliance works best in younger children whose bones are still responsive to external forces.
Practical Details Parents Need to Know
Phase 1 treatment requires a time commitment from both the child and the parent, including regular office visits and at-home appliance care.
Timing and Duration of Treatment
Phase 1 treatment typically begins between the ages of 7 and 10. Treatment usually lasts between 6 and 18 months, depending on the type of problem and the appliance used. A palatal expander, for example, may be actively turned for a few weeks and then left in place for several months to stabilize the expansion.
After the active phase ends, most children enter a resting or monitoring period. During this time, the orthodontist sees the child every few months to track the eruption of remaining permanent teeth. This monitoring phase can last two to four years, until enough permanent teeth have come in to evaluate whether Phase 2 (full braces or aligners) is needed.
Not all children who complete Phase 1 will need Phase 2. Some do. The two-phase approach means the total time in active orthodontic appliances may be longer than a single-phase approach that begins in the teen years. Parents should discuss the expected timeline and likelihood of Phase 2 with their orthodontist before starting.
Preparing Your Child for Treatment
Children in this age group can generally cooperate with orthodontic treatment, but preparation helps. Explain what the appliance will feel like using simple, honest language. Avoid words like "pain" but acknowledge that new appliances can feel tight or unusual for a few days.
Good oral hygiene becomes even more important with appliances in the mouth. Brackets, expanders, and space maintainers create areas where food can collect. Parents should supervise brushing and help with flossing around appliances. A pediatric dentist can provide specific cleaning instructions and fluoride treatments to reduce cavity risk during treatment. [2] [3]
Dietary adjustments are also necessary. Sticky, hard, and chewy foods can damage appliances and should be avoided. Your orthodontist will provide a list of foods to skip.
What Happens During Phase 1 Treatment
Phase 1 treatment follows a predictable sequence: evaluation, records, appliance placement, active treatment, and monitoring.
The Initial Orthodontic Evaluation
At the first visit, the orthodontist examines your child's teeth, bite, and jaw alignment. The orthodontist will look at how the upper and lower jaws relate to each other, whether permanent teeth have enough room to erupt, and whether any habits like thumb-sucking are affecting development.
If the orthodontist sees a potential problem, diagnostic records are taken. These typically include digital X-rays (a panoramic radiograph showing all developing teeth and a lateral cephalometric image showing jaw relationships), photographs of the teeth and face, and in many offices, a 3D digital scan of the teeth instead of traditional impressions.
Using these records, the orthodontist develops a diagnosis and treatment plan. The plan will specify which appliance is recommended, how long active treatment is expected to take, the cost, and the likely need for Phase 2 later.
Active Treatment and Adjustment Visits
Once the appliance is placed, your child will visit the orthodontist every four to eight weeks for adjustments. For an expander, parents are typically instructed to turn a small key in the appliance once or twice daily for a set number of weeks. The orthodontist checks progress at each visit and may take new X-rays periodically.
Mild discomfort is normal after each adjustment. Over-the-counter pain relievers and soft foods for a day or two typically manage any soreness. Children adjust quickly. Most report that the appliance feels normal within a week of placement.
Once the treatment goal is reached, the appliance may remain in place as a passive retainer for a few months to stabilize results. It is then removed, and the monitoring phase begins.
Monitoring Period and Transition to Phase 2
After active Phase 1 treatment ends, the orthodontist sees your child approximately every six months. These visits track how the remaining permanent teeth are erupting and whether the corrections from Phase 1 are holding.
When all or most permanent teeth have erupted, typically around ages 11 to 14, the orthodontist evaluates whether Phase 2 treatment is needed. Phase 2 usually involves full braces or clear aligners on all permanent teeth. The goal of Phase 2 is to fine-tune the bite and align the remaining teeth.
Because Phase 1 addressed the larger structural problem, Phase 2 treatment may be shorter or simpler than it would have been without early intervention. However, this varies by case. Some children achieve a stable, well-aligned result after Phase 1 alone and do not need further treatment.
Cost of Phase 1 Orthodontic Treatment
Phase 1 orthodontic treatment typically costs between $1,500 and $3,500. Costs vary by location, provider, and case complexity.
The type of appliance affects cost. A palatal expander alone is generally at the lower end of that range. Partial braces combined with an expander or a facemask will be closer to the higher end. Diagnostic records, including X-rays and digital scans, may be included in the treatment fee or billed separately.
Many orthodontic offices offer interest-free payment plans that spread the cost over the duration of treatment. Ask about this at the consultation visit. If Phase 2 is later needed, it carries its own separate fee, though some practices offer a reduced Phase 2 fee for patients who completed Phase 1 in their office.
Dental insurance plans that include orthodontic benefits typically cover a portion of treatment, often with a lifetime maximum for orthodontics. The lifetime maximum applies across both Phase 1 and Phase 2, so parents should factor this into planning. Contact your insurance provider before treatment begins to understand your specific coverage. Flexible spending accounts (FSAs) and health savings accounts (HSAs) can also be used for orthodontic expenses.
When to See an Orthodontist vs. a General Dentist
A general or pediatric dentist is often the first to notice signs that a child may need orthodontic treatment. The orthodontist is the specialist who diagnoses and delivers that treatment.
Your child's dentist may refer you to an orthodontist if they notice a crossbite, an underbite, significant crowding, protruding front teeth, or early or late loss of baby teeth. A persistent thumb-sucking or tongue-thrust habit past age 5 is another common reason for referral. [2] [3]
An orthodontist has two to three years of specialty training beyond dental school, focused specifically on tooth movement and jaw growth. While some general dentists offer limited orthodontic services, complex cases involving skeletal discrepancies, impacted teeth, or growth modification are best managed by an orthodontist.
If your child is approaching age 7 and has not yet had an orthodontic screening, ask your pediatric dentist whether a referral is appropriate. Even if no treatment is needed, a baseline evaluation provides valuable information for tracking development. A Cochrane review on early treatment for Class II malocclusion noted that the decision about timing requires careful professional assessment, as not all children benefit from early intervention. The same review found that the main documented advantage of starting treatment early for prominent upper front teeth is a reduced risk of dental trauma during childhood, rather than a better final bite result. [1] The orthodontist's job is to weigh that trauma-protection benefit against the cost and time commitment of two-phase treatment, and to determine whether early treatment will produce a meaningful benefit or whether waiting is the better option.
Find a Pediatric Dentist or Orthodontist Near You
If your child is due for an orthodontic evaluation, or if your dentist has recommended Phase 1 treatment, finding the right specialist is the next step. Visit the pediatric-dentistry page to search for qualified pediatric dentists and orthodontists in your area who treat children with developing bite and jaw concerns.
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