Oral and Facial Growth Milestones in Kids and Teens

A child's face and mouth are not just getting bigger as they grow, they are taking shape in ways that depend a lot on everyday habits. How a child breathes, where the tongue rests, and how they chew and swallow all help guide the jaw, the palate, and the airway as they develop. Understanding the broad milestones can help you notice early when growth may be drifting off course.

Early Childhood: The Foundation Years

By the time a child reaches school age, the palate and jaw are actively shaping around the habits that are in place. This is the stretch where oral posture starts to leave a lasting mark. A child who breathes through the nose, keeps the lips together at rest, and rests the tongue up against the roof of the mouth is giving the upper jaw the gentle, steady support it needs to widen properly.

When those habits are missing, growth can head in a less ideal direction. A 2021 systematic review in BMC Oral Health found that children who breathe through the mouth show measurable differences in facial skeletal growth compared with nasal breathers, often trending toward a narrower palate and a longer, more downward growth pattern. Proper Tongue Posture: What It Is and Why It Matters explains why the tongue acts as a natural guide for the upper jaw during these years.

The Middle Years: Habits Become Structure

As permanent teeth come in and the face lengthens through the elementary and pre-teen years, the patterns set earlier start to show up in structure. A palate that had room to widen tends to give the adult teeth space to come in straight. A narrow one is more likely to crowd them.

This is also the window where habits like thumb sucking, nail biting, or a persistent tongue thrust can leave a visible imprint on the bite. The way a child swallows matters here too, since the tongue presses against the palate with every swallow, all day long. Mouth Breathing and Face Shape: Is There a Connection? goes deeper on how breathing patterns in particular can influence the way the face grows.

The Teen Years: Growth Slows, Patterns Set

Through adolescence, the jaw and face finish most of their growth, and the patterns that took hold earlier become harder to shift. This is often when long-standing habits become visible as crowding, an open bite, or the need for orthodontic work.

A few signs tend to show up together when oral development has drifted:

• Habitual mouth breathing, day or night

• A tongue that rests low or pushes forward when swallowing

• Crowded or protruding teeth, or a visibly narrow palate

• Ongoing snoring

None of these alone is cause for alarm, but together they suggest the muscles and posture guiding growth may need support. Growth slowing down does not mean the door has closed either; teens and adults can still make meaningful changes to oral posture, breathing, and muscle function, even after the jaw has largely finished growing.

The goal of an evaluation isn't to label what already happened, it's to find out which of these habits are still active and worth guiding now, while growth is still underway or shortly after. Myofunctional Therapy: What It Is and How It Works explains how a structured program supports better oral function at any stage. If you have noticed any of the signs above in your child or teen, reach out and we can talk through what you are seeing.