Why waiting until age 7 may already be too late —
and what to look for from the moment your child’s first teeth appear.
By Dr. Mandeep Johal, DMD | Family Dental Centre / Tongue & Lip Tie Centre | Canada | @drmandeepjohal
The Most Common Thing I Hear
The most common thing I hear from parents in my clinic is some version of this: “Our dentist said to come back when all the adult teeth are in.”
For some children, that advice is perfectly fine. But for others—and I see this every week—by the time the adult teeth arrive, the opportunity for early guidance has already passed.
The jaw is already too narrow, and the space needed for healthy development was never created.
The American Dental Association recommends a first orthodontic screening at age 7. That’s a reasonable guideline for the general population. But in clinical practice, I regularly see children as young as three years old showing clear, measurable signs that their dental development is already heading in the wrong direction.
“A three-year-old with crowded baby teeth is not a child who might need orthodontic treatment someday. They are a child who needs assessment now.”
What Baby Teeth Actually Tell Us
Baby teeth are not placeholders. They are active architects of the jaw. They stimulate bone growth, maintain space, guide the eruption of permanent teeth, and shape the developing arch.
When baby teeth are crowded, it is not because the teeth are too big. It is because the jaw is too small.
A jaw that is already too small at age three does not simply grow into the right size on its own. The permanent teeth, which are significantly larger than baby teeth, will arrive to find even less space than the baby teeth had.
What crowded baby teeth are actually telling you:
Crowding in the primary dentition signals that the dental arch is underdeveloped. This is often connected to mouth breathing, low tongue posture, a history of prolonged pacifier or bottle use, or a tongue tie—all of which reduce the natural pressure the tongue places against the palate during rest and swallowing.
Signs to Watch For at Every Age
Ages 2-4—Jaw Development & Airway Foundations
This is the period most providers overlook and the most powerful window for early guidance.
- Crowded or overlapping baby teeth (the arch is already too narrow)
- Very little spacing between baby teeth
- Mouth breathing at rest or during sleep
- Open mouth posture – lips not comfortably resting together
- Snoring, restless sleep, or frequent night waking
- Thumb sucking or finger sucking past age 2
- A very narrow or high-arched palate
- History of tongue tie, even if already released
Ages 5-6 — The Last Easy Window
- Crowded baby teeth with no gaps
- Crossbite—upper teeth biting inside the lower teeth
- Mouth breathing continuing despite no current illness
- Teeth grinding (bruxism)
Ages 7-10 — The Phase 1 Window
- Crowding as permanent teeth erupt
- Permanent teeth erupting behind baby teeth (‘shark teeth’)
- Significant overjet or underbite
- A narrow dental arch
What Does “Early Orthodontic Treatment” Actually Mean?
Early orthodontic treatment—sometimes called Phase 1 or interceptive orthodontics—refers to treatment that begins before all the permanent teeth have erupted, typically between ages 6 and 10. It is not about putting braces on young children.
Common early orthodontic interventions include:
- Airway-Focused Treatment
Addresses mouth breathing, tongue posture, and sleep-disordered breathing.
What Happens If We Wait?
Waiting is absolutely the right call for many children. But there are situations where waiting has real costs: jaw asymmetry, permanent changes from habits, narrowed airway development, increased treatment complexity, and psychological impact.
Questions Parents Ask Most Often
At what age should my child first see an orthodontist?
The ADA recommends an initial orthodontic screening at age 7. But if you are seeing crowding, mouth breathing, or a narrow arch in a younger child, seek assessment earlier.
My child’s teeth look straight – do they still need to be seen?
Yes. Straight teeth can hide a narrow arch, a poor bite relationship, or a breathing pattern that is silently affecting development.
My child is already 10 or 11. Have we missed the window?
Not necessarily. Many children still have excellent growth potential at 10 or 11, particularly for palate expansion and jaw guidance.
