The Connection Between Mouth Breathing, Sleep & Orthodontic Issues

Many parents have seen it. A child sleeps with their mouth open, snores, or seems tired after a full night in bed. It is easy to write off as a phase.

How a child breathes can matter for sleep, and researchers have long wondered whether it also shapes how the teeth and jaws develop. This post explains what is known, what is still debated, and when it makes sense to have your child checked. Jaffe Orthodontics, with offices in Barrington and Portsmouth, RI and Swansea, MA, offers early orthodontic evaluations for children.

Nose Breathing vs. Mouth Breathing

Breathing through the nose is the normal pattern. Chronic mouth breathing, where a child breathes through the mouth most of the time, often points to something making nasal breathing hard. Occasional mouth breathing with a cold is not a concern.

Common Causes of Chronic Mouth Breathing

Mayo Clinic lists enlarged tonsils and adenoids as the main risk factor for obstructed breathing in children, especially younger ones. Adenoids are tissue at the back of the nose. Other causes include nasal congestion, allergies, and in some cases the shape of the face or head. A pediatrician or ear, nose, and throat specialist is the right person to find the cause.

How Mouth Breathing May Affect Teeth and Jaws

A 2025 paper in the American Journal of Orthodontics and Dentofacial Orthopedics says mouth breathing, particularly in early childhood, is believed to be associated with certain craniofacial features. These include a narrow, high-arched palate, a retruded lower jaw, lip incompetence (difficulty closing the lips comfortably), and increased facial height.

The same paper notes there is significant debate about the orthodontist’s role in identifying and managing mouth breathing in young children. That is worth keeping in mind. The link between breathing and jaw growth is an area of active discussion, not a settled rule.

A narrow palate can leave less room for teeth, which may contribute to crowding or a crossbite. Whether a given child’s tooth position is caused by breathing, genetics, habits, or a mix of these is something an exam can help sort out.

Mouth Breathing and Sleep

Mouth breathing can be a sign of sleep-disordered breathing. According to Mayo Clinic, symptoms of pediatric obstructive sleep apnea include:

• Snoring.
• Snorting, gasping, coughing, or choking during sleep.
• Mouth breathing.
• Trouble learning and paying attention.
• Sleepiness during school or short car rides.

Mayo Clinic also notes that children with sleep apnea are more likely than adults to show behavior issues such as acting hyper or not paying attention. NHLBI lists bedwetting and morning headaches among the signs.

Only a healthcare provider can diagnose sleep apnea. If your child snores often, see your child’s healthcare professional.

What Treatment Can Look Like

Treatment depends on the cause. The first treatment for pediatric sleep apnea may be surgery to remove enlarged tonsils and adenoids, according to Mayo Clinic. NHLBI lists oral devices or orthodontic treatment, and mouth and facial muscle exercises, among the other options.

For orthodontics specifically, systematic reviews have looked at rapid maxillary expansion, an appliance that widens the upper jaw. A 2022 systematic review and meta-analysis in PMC examined its effect on upper airway volume in children with mouth breathing. Results across studies vary, and expansion is not a cure for every child. Orthodontic treatment for a breathing problem works best as part of a team approach with your child’s doctor.

When to See an Orthodontist

The American Association of Orthodontists recommends a first evaluation by age seven, as noted on our early treatment page. At that visit, Dr. Jordan Jaffe can check how your child’s teeth and jaws are developing, including a narrow upper jaw or a crossbite. Many children will not need treatment right away. Some will just be monitored.

Bring up any of these at the visit:

• Frequent snoring or noisy breathing at night.
• A child who sleeps with the mouth open.
• Trouble breathing through the nose.
• Daytime tiredness, or trouble focusing.

If your child has breathing or sleep symptoms, also check in with their pediatrician.

Frequently Asked Questions

Does mouth breathing cause crooked teeth?

It may play a part, but it is not the only factor. Researchers still debate how strongly breathing affects jaw and tooth development, and genetics and habits matter too.

Is mouth breathing the same as sleep apnea?

No. Mouth breathing is one possible sign of sleep-disordered breathing, but it has other causes. A healthcare provider has to diagnose sleep apnea.

Can an orthodontist treat mouth breathing?

An orthodontist can evaluate the jaws and teeth and may recommend an appliance in some cases. The cause of the blocked breathing often needs a doctor too.

Schedule an Evaluation at Jaffe Orthodontics

If you are worried about your child’s breathing, sleep, or bite, a visit is a good first step. Contact Jaffe Orthodontics to schedule a complimentary consultation.

Share on