Children

Dental and Oral Development in Children

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A dentist examining a young girl's teeth in a clinic chair

Reviewed by Dr. Yana Pekarski, DDS · Doctor of Dental Surgery and co-founder of DrSensory · View full bio → · Last updated August 27, 2026

A child’s mouth does more than hold teeth. The same structures are involved in breathing, feeding, speech, and sleep, which is why oral development connects to areas parents rarely associate with a dentist. One thread runs through much of this section: how a child breathes. Persistent mouth breathing changes the resting position of the tongue and jaw, and research in school-age children has found impaired nasal breathing, mouth breathing, restricted tongue mobility, and enlarged tonsils are all significant risk factors for sleep-time teeth grinding. Dental issues in children are also frequently first noticed by a parent rather than a dentist — which makes knowing what to look for genuinely useful.

Topics covered here

Teeth and enamel

Discolored teeth · Tooth sensitivity · White spots on teeth · Enamel hypoplasia

Jaw and bite

Jaw clicking and TMJ · Tooth grinding · Daytime grinding · Early signs of malocclusion

Oral function and airway

Tongue ties · Lip ties · Breathing and chewing · Nighttime drooling and mouth breathing · Oral reflexes

Habits and early care

Pacifier use · Baby bottle use · First dental visit · Dental X-rays

The airway thread

Worth understanding, because it connects things that look unrelated.

The mouth, nose, tongue, and jaw work together. When one part isn’t functioning as expected — a blocked nose, enlarged tonsils, restricted tongue movement — the others adapt.

What that adaptation can look like: persistent mouth breathing · a tongue resting low rather than against the palate · changes in how the jaw and palate develop over time · disrupted sleep · daytime tiredness and difficulty concentrating

And the research connection: a study of school-age children found that impaired nasal breathing, mouth breathing while awake or asleep, restricted tongue mobility, and enlarged tonsils were each significant risk factors for probable sleep bruxism — with a combined effect where more than one was present.

The causal direction isn’t settled, and it’s worth being clear about that. What’s established is the association, and the practical value of mentioning all of it together.

If your child grinds their teeth, snores, breathes through their mouth, or sleeps restlessly, mention all of it at the same appointment. Individually those might each be dismissed. Together they’re a pattern worth investigating.

What parents notice first

Most dental concerns in children are noticed at home before a dental visit.

Worth mentioning at your next appointment

  • white, brown, or gray patches on teeth
  • a tooth that has changed color
  • sensitivity to cold or during brushing
  • avoiding brushing a particular area
  • grinding sounds at night
  • snoring or mouth breathing
  • difficulty with certain textures at meals
  • jaw clicking or pain

Contact a dentist promptly for

  • Any injury to the mouth or teeth, even where the tooth looks fine
  • A single tooth turning gray, dark, or pink
  • Pain that wakes a child at night
  • Facial or gum swelling
  • Fever alongside dental pain

When to start dental care

First tooth or first birthday, whichever comes first, is the usual guidance for a first dental visit. Earlier than most parents expect, and the purpose is as much about prevention and habit-building as about treatment.

RelatedSensory processing and feedingPreparing your child for their first dental visit

Sensory differences and dental care

Brushing and dental visits are genuinely harder for some children, and it isn’t behavior.

Toothpaste texture and flavor, the sensation of a brush, bright lights, unfamiliar sounds, and lying back in a chair are all significant sensory demands. A child who resists may be finding it intolerable rather than being uncooperative.

RelatedDental signs of sensory processing differencesSensory over-responsivity

Worth telling the dental practice in advance — many will adjust the appointment, and some have specific experience with it.

Where the mouth connects to the rest of development.

Speech and language

The structures that shape sounds, and what actually affects speech.

Learn more →

Sensory processing

Brushing and dental visits are sensory demands before they are anything else.

Learn more →

Sensory over-responsivity

Why a child may find toothpaste or a toothbrush genuinely intolerable.

Learn more →

Find a therapist

Feeding, oral-motor and sensory support near you.

Learn more →

Frequently Asked Questions

When should my child first see a dentist?
By the first tooth or the first birthday, whichever comes first. The first visit is largely about prevention, guidance, and getting a child comfortable.
Why does my child grind their teeth at night?
It’s common and often resolves. Stress is a documented factor, but research has found impaired nasal breathing, mouth breathing, restricted tongue mobility, and enlarged tonsils are all significant risk factors — so it’s worth mentioning any snoring or mouth breathing too.
Does mouth breathing matter?
It can. Persistent mouth breathing changes the resting position of the tongue and jaw and is associated with several oral and sleep-related findings. Worth raising with your dentist or doctor.
My child has white spots on their teeth. What are they?
Several possibilities — a developmental enamel defect, early decay, fluorosis, or thin enamel. They look similar and are managed differently, so assessment matters. Early decay in particular is reversible at that stage.
My child won’t let me brush their teeth.
Sometimes sensory rather than behavioral. Toothpaste flavor and texture, brush sensation, and the routine itself can all be genuinely difficult. Adjusting those often helps more than insisting.
Are dental X-rays safe for children?
Modern pediatric dental X-rays use very low doses and are taken when there’s a specific reason. Your dentist should explain why one is needed.

Disclaimer. For general educational purposes; not medical advice, diagnosis, or treatment. Contact a dentist promptly for any dental injury, or for pain, swelling, or a tooth that changes color.