Quick answer: Phase 1 orthodontic treatment happens while a child still has a mix of baby and adult teeth, usually between ages 6 and 10, and focuses on guiding jaw growth rather than perfecting the smile. Phase 2 happens later, usually between ages 11 and 14 once most permanent teeth are in, and is the more familiar full set of braces or aligners that aligns every tooth. Most children only need Phase 2. The American Association of Orthodontists recommends an evaluation by age 7 for every child, but that’s to identify the small number who genuinely benefit from early treatment, not to start treatment for everyone.
If your child’s dentist has mentioned an orthodontic evaluation at age 7, you might be picturing braces on a first-grader. That’s rarely what actually happens. The terms Phase 1 and Phase 2 cause a lot of confusion for exactly this reason, so here’s what each one actually means, and just as importantly, when your child probably doesn’t need either one yet.
What Is Phase 1 Orthodontic Treatment?
Phase 1, also called early or interceptive treatment, happens while a child is still in mixed dentition, meaning they have a combination of baby and adult teeth. According to the American Association of Orthodontists, this stage focuses on guiding proper jaw growth and reducing the risk of more complex problems developing later, rather than on cosmetically straightening every tooth.
This generally happens between ages 6 and 9. The goal isn’t a finished smile. It’s addressing a specific, identifiable problem while the jaw is still actively growing and easier to guide.
What Is Phase 2 Orthodontic Treatment?
Phase 2 is what most people picture when they think of orthodontics: a full set of braces or clear aligners, applied once most or all of the permanent teeth have come in.
This typically starts between ages 11 and 14. According to Invisalign, the goal at this stage is aligning every permanent tooth precisely and establishing a bite that functions well, not just guiding growth in a general direction.
Many children go straight to Phase 2 with no Phase 1 beforehand, which is completely normal and, for most kids, the more common path.
Does Every Child Need Phase 1 Treatment?
No, and this is worth being direct about. The American Association of Orthodontists recommends every child have an orthodontic evaluation by age 7. That recommendation gets misread constantly as “every child needs treatment by age 7.”
It doesn’t mean that. It means enough permanent teeth are usually in by that age for an orthodontist to identify developing problems, if any exist. Most 7-year-olds who get evaluated need nothing at all beyond continued monitoring.
Phase 1 treatment is reserved for specific situations where early intervention genuinely changes the outcome, not applied as a default first step for every child.
What Problems Does Phase 1 Treatment Address?
Phase 1 tends to make sense for issues that are easier, or safer, to correct while the jaw is still growing:
- A crossbite, where the upper and lower teeth don’t line up correctly from side to side
- A narrow upper jaw, which Phase 1 can help widen while the bones are still developing
- Severe crowding, where there’s clearly not enough room for incoming permanent teeth
- Protruding front teeth, which carry a real risk of injury and are one of the clearest, best-documented reasons for early treatment
- An underbite, where the lower jaw sits ahead of the upper jaw
If your child has already been flagged for a possible bite issue, our guide on does my child need braces covers the early warning signs in more detail.
When Should My Child Have Their First Orthodontic Evaluation?
By age 7, according to the American Association of Orthodontists, regardless of whether anything looks obviously wrong. This isn’t the same as starting treatment. It’s simply the point where enough permanent teeth have usually come in for a trained eye to catch a developing problem early, while there’s still time to act on it if needed.
HealthyChildren.org, the American Academy of Pediatrics’ parent site, similarly encourages routine dental and orthodontic monitoring throughout childhood rather than waiting until a problem becomes obvious. Nemours KidsHealth takes the same general approach, framing regular check-ups as the way most developing issues, orthodontic or otherwise, get caught early rather than after they’ve become harder to treat.
Some of the issues an early evaluation looks for connect to habits and airway development covered elsewhere in our early orthodontic care series, including our guides on mouth breathing in children and tongue-tie and lip-tie in babies, both of which can influence how the jaw and bite develop over time.
What Happens Between Phase 1 and Phase 2?
If a child does complete Phase 1, there’s typically a resting period before Phase 2 begins, lasting anywhere from one to three years while the remaining permanent teeth come in.
During this time, a retainer usually holds the Phase 1 results in place. Regular check-ins, roughly every 6 to 12 months, let the orthodontist track how the permanent teeth are coming in and confirm when it’s the right time to start Phase 2.
Does Phase 1 Treatment Make Phase 2 Shorter or Easier?
Often, yes, particularly for children with genuine skeletal or bite issues that Phase 1 was designed to address. But it’s not a guarantee for every case, and it isn’t the main reason Phase 1 gets recommended in the first place.
The clearest, best-documented benefit of Phase 1 treatment is protecting prominent front teeth from injury. Everything else, including a potentially shorter or simpler Phase 2, is a reasonable expectation in many cases rather than a certainty.
What Appliances Are Used in Phase 1 Treatment?
The specific appliance depends entirely on what problem is being addressed. The American Academy of Pediatric Dentistry discusses guiding dental development in young children as an area where pediatric dentists and orthodontists often coordinate closely, since a pediatric dentist is frequently the first to notice a developing issue at a routine check-up.
- Palatal expanders, used to widen a narrow upper jaw, which we cover in more detail in an upcoming guide on our blog
- Habit-breaking appliances, often used for prolonged thumb-sucking that’s affecting tooth or jaw development, also covered in an upcoming dedicated guide
- Partial braces, applied to just a few teeth that need early guidance
- Bite plates or other functional appliances, used to help correct how the upper and lower jaw meet
Frequently Asked Questions
What is the difference between Phase 1 and Phase 2 orthodontic treatment?
Phase 1 happens while a child still has a mix of baby and adult teeth, usually between ages 6 and 10, and focuses on guiding jaw growth. Phase 2 happens once most or all adult teeth are in, usually between ages 11 and 14, and focuses on aligning the teeth precisely.
Does every child need Phase 1 orthodontic treatment?
No. Most children do not need Phase 1 treatment. The American Association of Orthodontists recommends every child have an evaluation by age 7, but that checkup is about identifying the few children who would benefit from early treatment, not starting treatment for everyone.
At what age should my child first see an orthodontist?
The American Association of Orthodontists recommends a first orthodontic evaluation by age 7, since enough permanent teeth are usually in by then for an orthodontist to spot developing bite or jaw growth issues.
What happens between Phase 1 and Phase 2 treatment?
Children typically enter a resting period lasting one to three years while the remaining permanent teeth come in. A retainer usually holds the Phase 1 results in place, with check-ins every 6 to 12 months until Phase 2 begins.
Does Phase 1 treatment make Phase 2 shorter or easier?
Often, yes, particularly for children with genuine skeletal or bite issues, but it is not guaranteed for every case. The clearest proven benefit of Phase 1 is protecting prominent front teeth from injury.
The Bottom Line
The confusion around Phase 1 and Phase 2 usually comes down to one misunderstanding: an early evaluation is not the same as early treatment. Most children who see an orthodontist at age 7 need nothing more than a follow-up appointment down the road. For the small number who do have a genuine early issue, Phase 1 can make a real difference in how their bite and jaw develop, part of the broader picture we cover in how poor oral health can affect your child’s overall health. Either way, the only way to know which category your child falls into is an actual evaluation, not guesswork. This article is part of our developing guide to early orthodontic care, alongside our pieces on mouth breathing and tongue-tie. You can browse more guides like this on our blog.
Medically reviewed by the pediatric dentists at Shine Dental Clinic, Lalitpur, Nepal.
Wondering whether your child needs an orthodontic evaluation? The team at Shine Dental Clinic offers gentle, child-focused check-ups in a calm environment built for little ones. Book an appointment on WhatsApp and we’ll help you figure out the right timing.