Patient guide · Timing
If your child is seven or eight, you may have been told they need braces now, in an early "Phase 1," with more to follow later. Sometimes that is genuinely the right call. Often, waiting is just as good. This guide lays out what the best evidence actually shows about early treatment, so you can ask the one question that matters: what specific problem does starting now solve that waiting would not?
Early or "two-phase" treatment means a first round of orthodontics in the mixed-dentition years, roughly ages seven to eleven, while a child still has a mix of baby and adult teeth, usually followed by a second round with full braces once the permanent teeth are in. The appeal is intuitive: catch a problem while the child is still growing and you can guide things that would be harder to change later. For some specific problems, that intuition is right. For the most common reason it is recommended, the evidence is more sobering.
For the most-studied scenario, prominent upper front teeth (a Class II bite), the answer from high-quality trials is clear and a little surprising: treating early does not produce a better final bite than simply waiting and treating once in the early teens. When researchers pooled dozens of randomized trials, children who did two phases ended up with the same final result as children who did one phase later, just after more total time in appliances.1 The landmark two-phase trials found the same thing: early treatment changed the timing and length of care, not the destination.2 There is one important, well-demonstrated exception to this "no advantage," and it is about safety, not straightness.
"No better final bite" is not the same as "never worth doing." The same trials that found no cosmetic advantage found a real one: children with prominent, protruding upper front teeth are more likely to injure them, and early treatment that tucks those teeth back reduces the risk of trauma in the meantime, roughly cutting new incisor injuries from about a third of children to a fifth. Beyond that, there are other legitimate, case-by-case reasons an orthodontist may recommend acting early: correcting a crossbite that is wearing teeth or shifting the jaw, making room for a tooth that is erupting into trouble, intercepting a harmful habit, or addressing a problem that is causing a child real social distress. These are specific indications with specific reasons. The point is not that early treatment is wrong; it is that it should be tied to a concrete problem it solves now, rather than offered as a general head start.
There is one more reason to be skeptical of "treat early so it lasts": teeth drift regardless of when they were straightened. Decades of long-term follow-up show that lower-front alignment relapses to some degree in most people after treatment, and that the amount is highly variable and cannot be reliably predicted in advance.3 Arch length also shortens with age in people who never had braces at all; some later crowding is simply a normal change of aging, happening even to the untreated.4 The practical consequence is the same for everyone: long-term retainer wear, not the age treatment started, is what keeps teeth aligned. Starting at seven rather than twelve does not buy permanence.
None of this means early treatment is a scam, and plenty of children genuinely benefit from it. It means the timing decision deserves a clear reason. A fair question to ask any clinician recommending Phase 1 is simply: what specific problem does starting now fix that waiting a few years would not? If the answer is a concrete one, protecting protruding teeth from injury, correcting a functional crossbite, making room for an erupting tooth, easing real social distress, that is a sound basis for acting early. If the answer is a general "it is better to start young" or "to prevent crowding," the evidence does not support that, and watchful waiting with good monitoring is a perfectly responsible choice.
Why crowding happens, and why some of it is simply time passing rather than anything treatment timing can prevent.
Nance's limits versus Ricketts's possibilities, and the field's long, honest argument over what treatment can promise.