Why toddler grinds teeth at night?

It’s a sound that can stop you mid-step: the rough, repetitive scrape of teeth grinding while your toddler sleeps. It’s loud. It’s unsettling. And if you’ve Googled it at 3 a.m., you’re not alone.

But here’s the reality: for most toddlers, nighttime teeth grinding is not a cause for alarm. It’s a common, usually harmless part of development—just one of many signals that the nervous system is still learning how to regulate itself during sleep. Let’s unpack what it really means.

Teeth grinding, or bruxism, happens when a child involuntarily clenches or rubs their upper and lower teeth together. It’s most common at night, particularly during REM sleep when brain activity is high and muscle tone changes.

The behavior is rarely intentional. Most toddlers aren’t even aware they’re doing it, and many sleep right through the noise themselves. Parents, however, hear it loud and clear—especially in quiet co-sleeping setups. What might sound like a dental emergency is usually just a temporary motor pattern triggered by the nervous system at rest.

Roughly 14% to 17% of children grind their teeth at night, according to pediatric health studies. It often begins once both the top and bottom front teeth have erupted, usually around age 2. In most cases, it fades by age 6.

There’s no major difference between boys and girls when it comes to grinding prevalence. And while it’s more likely in children with certain developmental conditions like ADHD or Down syndrome, it’s also extremely common in children with no underlying issues.

Put simply: if your toddler grinds their teeth at night, they’re in good company.

There’s no single cause behind toddler bruxism, but several factors appear to increase the likelihood:

• Jaw and facial muscle development: As the brain learns to regulate muscle tone during sleep, some clenching is normal.
• Tooth eruption or alignment: Teething or uneven bite contact may trigger grinding as a form of sensory adjustment.
• Disrupted sleep patterns: Poor-quality sleep, night waking, or snoring can correlate with increased grinding.
• Emotional stress or overstimulation: Changes in daycare, new siblings, or separation anxiety can manifest physically.
• Pain or discomfort: Teething pain or even minor ear infections may prompt grinding as a self-soothing behavior.

Importantly, grinding often occurs in otherwise healthy children with no pain or stress at all. Sometimes, it just happens.

Not usually. Most toddlers are grinding their baby teeth, which are designed to be temporary. Even with nightly grinding, long-term damage is rare at this age. Mild grinding rarely causes any problems. The enamel may wear slightly, but this typically resolves once the behavior stops—and once adult teeth replace baby ones. The more severe risk occurs when grinding continues after age 6, or when it’s paired with symptoms like jaw pain, facial soreness, or visible tooth damage. That’s when it’s worth a deeper look.

While most toddler bruxism is harmless, it’s helpful to watch for the following signs that may suggest more serious wear or discomfort:

• Morning complaints of jaw pain or sore face
• Frequent headaches, especially after waking
• Teeth that appear worn down, chipped, or flattened
• Gums that are red, bleeding, or swollen
• Increased sensitivity to hot or cold foods

If you notice any of these, it’s worth discussing with your child’s pediatrician or dentist. They may recommend an exam or further observation.

Usually not. Most toddlers who grind their teeth don’t fully wake up and show no disruption to overall rest. But sleep studies have shown that in some children, grinding clusters with REM microarousals—short bursts of activity that fragment sleep even without waking. For some children, this fragmented sleep can correlate with daytime symptoms such as:

• Hyperactivity
• Short attention span
• Mood swings
• Fatigue or irritability

That said, these behaviors are common in toddlers for many reasons. Grinding alone isn’t a reliable red flag. But if it’s frequent and accompanied by poor sleep or behavioral issues, it’s worth tracking.

Also, don’t overlook the rest of the family. If the grinding sound is loud enough to wake a co-sleeping parent or sibling, it can affect their sleep too. Everyone’s rest matters.

There’s no need for treatment in most toddlers under six. Mouth guards aren’t typically recommended for this age group because baby teeth are still shifting and erupting. Instead, pediatricians often advise a “watch and wait” approach unless there’s clear evidence of dental harm.

However, a few supportive actions can help minimize unnecessary grinding or reduce its impact:

• Stick to consistent sleep routines: Toddlers thrive on structure. Regular bedtimes and calming pre-sleep rituals can reduce restlessness.
• Check for sources of discomfort: If your child is teething or fighting an ear infection, treating the pain may reduce grinding.
• Manage anxiety or overstimulation: Big changes in the household or daycare setting can add subconscious stress.
• Reduce stimulants before bed: Avoid sugary snacks, screen time, or intense activity within an hour of bedtime.

If your child continues grinding past age 6—or if your dentist detects visible tooth wear—then it may be time to consider additional strategies like behavioral therapy or in rare cases, a custom dental appliance.

In rare cases, grinding can be a secondary symptom of obstructive sleep apnea (OSA)—a sleep disorder where breathing is briefly interrupted multiple times during the night.

Watch for these signs:

• Loud, frequent snoring
• Gasping or pauses in breathing during sleep
• Restless sleep or frequent position changes
• Daytime sleepiness, crankiness, or difficulty concentrating

If you notice these along with teeth grinding, bring them to your pediatrician’s attention. A referral for a sleep study may be recommended to rule out OSA.

Here’s a simple checklist. See a dentist or pediatrician if your toddler:

• Still grinds regularly after age 6
• Shows visible tooth damage or gum issues
• Complains of pain in the jaw or face
• Has signs of poor sleep quality
• Snores or shows signs of disrupted breathing during sleep

In most cases, your provider will suggest monitoring and supportive care. But they’ll also help rule out rare causes like sleep apnea or misaligned bite.

Toddlers grow fast. Their nervous systems are developing, their muscles are maturing, and their sleep architecture is still forming. Grinding is often just noise—literally and developmentally. Instead of jumping to correct it, focus on sleep quality, comfort, and consistency. Keep their bedtime calm. Watch for signals. And don’t let late-night scraping sounds override your sense of perspective.

What sounds harsh is usually harmless. What your toddler needs most is your calm—not your correction.