5 Habits That Can Affect Your Child's Oral Development

We tend to think of childhood habits in terms of manners, routines, or screen time. But underneath those are quieter patterns that shape how your child breathes, sleeps, and even how their face grows. Some are so common they seem normal, and common does not always mean harmless.

In our Orange County practice, families are often surprised how much habits like mouth breathing or thumb sucking can influence long-term oral development. The encouraging part: once you know what to look for, you can guide your child toward healthier patterns. Here are five everyday habits worth watching.

1. Mouth Breathing

If your child breathes through the mouth rather than the nose, even part of the time, it affects more than moisture. Mouth breathing keeps the tongue low and inactive, which can influence how the upper jaw grows and contribute to a high palate, a narrow arch, and less airway space. You might also notice waking up tired, light snoring, or trouble focusing. Mouth Breathing and Face Shape: Is There a Connection? covers how this plays out over time.

2. Thumb or Finger Sucking

Thumb sucking often starts in infancy as comfort, and it is developmentally normal in the baby and toddler years. The American Association of Orthodontists notes that prolonged thumb sucking can cause protruding front teeth, an open bite, or a crossbite, with some bone changes noticeable as early as 18 months. It becomes more of a concern if it continues past age three or four, when steady pressure from the thumb can push the upper teeth forward, open the bite, or reshape the palate. Rather than yanking the habit away, families often do better with positive reinforcement, alternative comfort tools, and a gradual wind-down.

3. Tongue Thrust

Tongue thrust is a swallowing pattern where the tongue pushes forward against or between the teeth. It can seem minor, but repeated pressure can move teeth out of alignment or interfere with speech. Kids with a tongue thrust often also struggle to keep the lips closed or the tongue up at rest, which points to a broader pattern of breathing and muscle coordination. Myofunctional therapy is particularly good at retraining these movements toward a healthier swallow.

4. Prolonged Pacifier Use

Pacifiers offer comfort and self-regulation early on, but past around age two they can start to influence jaw growth and tooth position, much like thumb sucking. Transitioning away is not always easy; a consistent bedtime routine and a comfort object like a soft blanket can ease the shift without the oral impact.

5. Low Tongue Posture

The ideal resting position for the tongue is gently up against the roof of the mouth. When it rests low or against the teeth, it misses a chance to guide healthy growth of the upper jaw and help keep the airway open. Low posture can come from habit, mouth breathing, or a restriction like a tongue tie. Encouraging closed lips and nasal breathing is a good starting point. Proper Tongue Posture: What It Is and Why It Matters explains why that resting spot matters so much.

A Foundation That Lasts

Small habits add up over time. Noticing how your child breathes, rests, chews, and swallows lets you support their growth in ways that go well beyond appearance, including protecting orthodontic results down the road. If any of these sound familiar, you are far from alone, and a myofunctional evaluation can offer clarity and a gentle plan. A short discovery call is a clear-eyed way to get started.

This is general information, not medical advice. Concerns about your child's teeth, bite, or oral habits are worth discussing with your pediatric dentist or orthodontist alongside a myofunctional evaluation.