If your child has had an orthodontic exam around age 7, you may have heard the words “Phase 1” and wondered whether that means braces at 8, braces twice, or a sales pitch. It can be any of those depending on who’s saying it, so here’s how we use the terms at Varble Orthodontics.
Phase 1 orthodontic treatment is a short, targeted treatment done while a child still has baby teeth. Phase 2 is the full treatment most people picture, done once the adult teeth are in. A small number of children benefit from both. Most only need the second. This post covers what each phase is and the specific problems where treating early changes the result. It also covers the more common cases where it doesn’t, and what the years in between look like when the answer is “not yet.”
What Phase 1 and Phase 2 Actually Are
The two phases have different jobs, and the difference is easier to see side by side.
| Phase 1 | Phase 2 | |
| Typical age | 7 to 9, while baby teeth are still present | 11 to 14, once most adult teeth are in |
| Length | 6 to 12 months of active treatment | 12 to 18 months, depending on the case |
| Goal | Correct one specific problem while the jaw is growing | Align all the adult teeth and build the finished bite and smile |
| What’s used | Usually a single appliance: a palate expander, partial braces, or a small habit appliance | Braces (Damon Ultima) or clear aligners (Spark), with DentalMonitoring at-home scans replacing many office visits |
| What follows | A retainer, then growth checks until the rest of the adult teeth arrive | Retainers to hold the result long term |
Together they’re called two-phase orthodontic treatment, and Phase 1 is narrow on purpose. It exists to fix a structural problem, meaning something in how the jaw is growing rather than where a tooth sits, that gets harder to correct once growth slows, and it stops when that problem is fixed. It doesn’t try to straighten every tooth, because most of the adult teeth aren’t in yet and there’s nothing to straighten them into.
Phase 2 is the comprehensive treatment. For children who had Phase 1, it’s usually shorter and more predictable than it would have been, because the structural work is already done. For children who didn’t need Phase 1, it’s the only round, and it’s where the whole result gets built. Our braces for kids page covers what that round looks like day to day.
One point worth making early: Phase 1 does not replace Phase 2. Nearly every child who has early treatment still has comprehensive treatment as a teenager. If a practice suggests otherwise, it’s worth asking how the adult teeth that haven’t come in yet are going to end up aligned.
The Problems Where Phase 1 Changes the Outcome
The case for early orthodontic treatment rests on a small number of conditions. What they share is that the correction depends on growth that’s still happening, so waiting does more than delay the fix; it changes what the fix can be.
A narrow upper jaw with a crossbite. The upper jaw is two halves joined by a seam along the roof of the mouth. In a child, that seam is still flexible, and a palate expander can widen the jaw over a few months with light, steady pressure. In the mid-teens the seam fuses, and widening the jaw becomes a surgical conversation. A narrow upper jaw usually shows up as a crossbite in the back teeth, where the upper teeth bite inside the lower ones, and often as a jaw that shifts to one side when closing. Correcting it at 8 is routine. Correcting it at 16 is not.
Crowding severe enough to block adult teeth. Some crowding is normal as the larger adult teeth replace the baby teeth, and much of it resolves as the jaw grows. Severe crowding is different. When there’s so little room that an adult tooth has no path to come in, it can get stuck in the bone or erupt in the wrong place. Creating space at 8, sometimes with an expander, sometimes by removing a baby tooth on schedule, can let that tooth come in on its own. Found at 13, the same tooth may need surgery to bring down and months of extra treatment to position.
Jaw growth that’s heading the wrong way. When the lower jaw is growing ahead of the upper (an underbite), or the upper jaw sits significantly forward of the lower, the mismatch is in the bones rather than the teeth. While a child is growing, an appliance can guide that growth. Once growth is finished, the options for a mismatch in the jaws narrow to disguising it with tooth movement or correcting it with jaw surgery. For the patterns that respond to growth guidance, the window is childhood.
Front teeth that stick out far enough to be at risk. Upper front teeth that flare well ahead of the lower lip are exposed. A fall off a bike or an elbow in a soccer game can chip or knock out a tooth that would have been protected by the lip if it sat further back. When Dr. Varble sees front teeth in that position on an active 8-year-old, bringing them back with partial braces is as much about protecting the teeth over the next several years as it is about alignment.
Phase 1 earns its place when the exam finds one of these.
The Cases Where Waiting Gives the Same Result
Most children who have something visibly imperfect about their teeth at 7 don’t meet that test. For them, Phase 2 alone produces the same final result as two phases would, with a year less in appliances and a year less of appointments.
Mild to moderate crowding is the most common example. The front teeth come in overlapping or turned, and it looks like a problem. Often it partly resolves as the jaw grows and the baby molars, which are wider than the adult teeth that replace them, give back their space. What’s left gets corrected in Phase 2 in the normal course of aligning the adult teeth. Straightening those front teeth at 8 would mean straightening them again at 12 after the rest of the adult teeth arrive.
Spacing between the front teeth is another. Gaps at 7 are usually the jaw making room for teeth that haven’t come in yet. They close on their own or in Phase 2. Most deep bites, where the upper front teeth overlap the lower ones too far, fall in the same category: worth noting, worth watching, and correctable in comprehensive treatment.
Then there’s the lower jaw that sits too far back, the profile most parents call “an overbite.” It’s the most common bite problem in the category, and it’s one where the timing conversation cuts both ways. In some children it’s best addressed with growth guidance during the pre-teen growth spurt, which is later than Phase 1 but earlier than a typical Phase 2 start. In others it’s handled within Phase 2. Either way, it’s rarely a reason to start at 7, and treating it that early can mean treating it twice.
None of this means those children shouldn’t be seen. They should. The point of the early exam is to sort them into this group with an X-ray in hand rather than by guesswork. But once they’re sorted here, starting early adds cost and appointments without improving the outcome, and Dr. Varble would rather say that at the consultation than put an appliance in a mouth that didn’t need one.
What Growth Monitoring Looks Like in Between
Whether a child had Phase 1 or is waiting for Phase 2, the years in between aren’t idle. We call this period growth monitoring, and it’s an active plan with a schedule.
- Rechecks every 6 to 12 months. The interval depends on what’s being watched. A child with a canine (the pointed tooth at the corner of the smile) that’s drifting slightly off course gets seen more often than one whose only note is mild crowding.
- New records when they’ll show something. Some rechecks don’t need a new X-ray. When Dr. Varble expects a change, new images are taken and compared to the baseline from the first visit. A tooth that should have erupted by now, or a jaw measurement approaching a decision point, is the kind of thing that prompts them.
- A specific trigger for starting. Each child in monitoring has a stated reason that would move them to treatment. It might be a particular tooth erupting, a growth measurement crossing a line, or a Phase 1 result that needs Phase 2 to finish the job. Parents know what the trigger is, so the wait has a purpose.
- A retainer if Phase 1 was done. After early treatment, a retainer holds the correction while the remaining adult teeth come in. Monitoring checks that it’s being worn and that the result is holding.
There’s no appliance and no active treatment during monitoring, and the visits are short. For families, the practical effect is that a decision about braces gets made when the mouth is ready for it, rather than on a date picked years in advance.
How We Decide
The decision between “start Phase 1” and “watch and wait” isn’t a philosophy. It’s a reading of a specific child’s X-ray, scan, and growth against the four conditions in this post. If the exam shows a problem that gets harder to fix with time, early treatment is on the table and Dr. Varble will show you what he’s looking at and what the appliance is meant to accomplish. If it shows something that Phase 2 handles just as well, the plan is monitoring, and you’ll hear that plainly.
Two cautions keep that honest. Waiting isn’t automatically the conservative choice; for a narrow jaw or a blocked tooth, waiting is the more invasive choice, deferred. And early treatment isn’t automatically thorough; for mild crowding, it’s a second round of braces a child didn’t need. Neither answer is right by default. The exam decides that. .
Next Step
If your child is 7 or older and hasn’t been evaluated, the free VO Smile Assessment includes the X-ray, scan, and a plain recommendation about which of these groups your child falls into. Our post on [when your child should first see an orthodontist] covers what that exam involves. We see families at our Creve Coeur and St. Peters offices.
