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,⁠1 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.⁠2 You also see your child’s teeth more often than anyone else does — which makes knowing what to look for genuinely useful.

Topics covered here

Teeth and enamel

Discolored teethTooth sensitivityWhite spots on teethEnamel hypoplasia

Jaw and bite

Jaw clicking and TMJTooth grindingDaytime grindingEarly signs of malocclusion

Oral function and airway

Tongue tiesLip tiesBreathing and chewingNighttime drooling and mouth breathingOral reflexes

Habits and early care

Pacifier useBaby bottle useFirst dental visitDental 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 concentrating⁠1,3

And the research connection: a study of 96 children aged 6 to 12 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.⁠2

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

Many dental concerns are easier to spot at home, between visits.

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.⁠4

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 always about 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, and oral care challenges in autistic children are often linked with sensory over-responsivity.⁠5 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.⁠4
Why does my child grind their teeth at night?
It’s common: about one in four children aged 6 to 12 in one dental-clinic study met the criteria for probable sleep bruxism.⁠2 Researchers now see it as a motor activity rather than a disorder in itself, though it can be a sign of something else, such as sleep apnea. Stress is a documented factor,⁠6 and research has also found impaired nasal breathing, mouth breathing, restricted tongue mobility, and enlarged tonsils are all significant risk factors⁠2 — 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.⁠1 Worth raising with your dentist or doctor.
My child has white spots on their teeth. What are they?
Several possibilities — early decay, fluorosis, or another developmental defect in the enamel. They look similar and are managed differently, so assessment matters. Early decay in particular can be stopped or reversed at that stage.⁠7,8
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.⁠5 Adjusting those is worth trying before insisting.
Are dental X-rays safe for children?
Dental X-rays add only a small amount to the radiation everyone is exposed to, and for children they should be chosen for the individual child, not taken as a routine, with the exposure sized down for a child.⁠9 Your dentist should explain why one is needed.

Sources

  1. American Speech-Language-Hearing Association. Orofacial Myofunctional Disorders (Practice Portal). Enlarged tonsils and adenoids, swollen nasal tissue and allergies can obstruct the airway and lead to open-mouth posture and mouth breathing; signs include an abnormal tongue resting posture and sleep-disordered breathing; dental malocclusions correlate with tongue-thrust swallowing and oral habits. Checked October 6, 2026.
  2. Oh JS, Zaghi S, Ghodousi N, et al. Determinants of probable sleep bruxism in a pediatric mixed dentition population: a multivariate analysis of mouth vs. nasal breathing, tongue mobility, and tonsil size. Sleep Medicine. 2021;77:7–13. doi:10.1016/j.sleep.2020.11.007 (PMID 33291022).
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    In 96 children aged 6 to 12, 24% met criteria for probable sleep bruxism; impaired nasal breathing, mouth breathing awake or asleep, restricted tongue mobility and enlarged tonsils were significant risk factors, with a combined effect when several were present.
  3. Marcus CL, Brooks LJ, Draper KA, et al. Diagnosis and management of childhood obstructive sleep apnea syndrome. Pediatrics. 2012;130(3):e714–e755. doi:10.1542/peds.2012-1672 (PMID 22926176). AAP technical report: childhood sleep apnea “was associated with cardiovascular, growth, and neurobehavioral abnormalities,” and treatment “resulted in improvements in behavior and attention.”
  4. American Academy of Pediatric Dentistry. FAQ (for parents). “In order to prevent dental problems, your child should see a pediatric dentist when the first tooth appears, or no later than his/her first birthday.” Checked October 6, 2026.
  5. Stein Duker LI, Como DH, Jolette C, et al. Sensory adaptations to improve physiological and behavioral distress during dental visits in autistic children: a randomized crossover trial. JAMA Network Open. 2023;6(6):e2316346. doi:10.1001/jamanetworkopen.2023.16346 (PMID 37266941).
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    Autistic children have “greater oral care challenges, which are often associated with sensory overresponsivity”; a dental room with modified visual, auditory and touch input reduced distress during cleanings.
  6. Restrepo-Serna C, Winocur E. Sleep bruxism in children, from evidence to the clinic. A systematic review. Frontiers in Oral Health. 2023;4:1166091. doi:10.3389/froh.2023.1166091 (PMID 37252006). Sleep bruxism is now seen as “a motor activity” rather than a disorder; anxiety and stress increase its risk; it can sometimes be a sign of obstructive sleep apnea.
  7. National Institute of Dental and Craniofacial Research. The Tooth Decay Process: How to Reverse It and Avoid a Cavity. “A white spot may appear where minerals have been lost. This is a sign of early decay. Tooth decay can be stopped or reversed at this point.” Checked October 6, 2026.
  8. Centers for Disease Control and Prevention. About Dental Fluorosis. With fluorosis, “The outer enamel layer may have white flecks, spots, or lines”; in the US it is mostly mild and cosmetic. Checked October 6, 2026.
  9. American Dental Association. X-Rays/Radiographs. Dental imaging is a minor contribution to total radiation exposure; providers are urged to “select X-rays for individual needs, not as a routine” and to “child-size” the exposure for children. Checked October 6, 2026.

Medical disclaimer. This page is for general educational purposes and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about your child. Contact a dentist promptly for any dental injury, or for pain, swelling, or a tooth that changes color.