Why Does My Child Grind Their Teeth at Night? Causes and When to Worry

Children grind their teeth at night for many reasons: new teeth erupting, a misaligned bite, mouth breathing, or stress. It's common between ages 3 and 6 and usually harmless with baby teeth. See a dentist if grinding continues after permanent teeth arrive, causes visible wear, or comes with jaw pain or loud snoring.

At La Mirada One Dental, we hear this question almost weekly. A parent walks in during a family checkup and quietly asks, "Is it normal that I can hear my kid grinding from down the hall?" The sound is unsettling. The good news is that in most children, it's a phase, not a problem. But there are a few situations where it deserves a closer look.

What is pediatric bruxism?

Pediatric bruxism is repetitive clenching or grinding of the teeth during sleep. It happens involuntarily. Your child isn't doing it on purpose and usually doesn't remember it in the morning.

According to the American Academy of Pediatric Dentistry, bruxism affects a significant portion of children, with prevalence estimates ranging from about 15% to 40% depending on age and diagnostic criteria. It shows up most often between ages 3 and 6, then again around ages 6 to 9 when baby teeth start giving way to permanent ones. Most cases resolve on their own as children grow and their bite matures.

So if you're hearing it, you're not alone. Not by a long shot.

Why do children grind their teeth at night?

There isn't one single cause. Grinding is usually the body's response to something else going on. Here are the most common triggers we see in kids from La Mirada, Cerritos, and Norwalk families:

• Jaw and tooth development. As new teeth erupt, the bite changes. Grinding is one way the mouth adjusts.

• Airway issues. Enlarged tonsils, adenoids, or chronic mouth breathing can lead to grinding at night. Peer-reviewed sleep medicine research has linked sleep bruxism in children to sleep-disordered breathing.

• Stress or routine changes. A new baby at home, the start of the school year at a La Mirada USD elementary, or even a move can show up as nighttime grinding.

• Misaligned bite. When upper and lower teeth don't meet cleanly, grinding can be the body's attempt to find a comfortable resting position.

• Earaches or teething discomfort. Younger children sometimes grind in response to nearby pain.

Often it's a combination. A child dealing with a new molar coming in during the first week back at school might grind more for a stretch, then stop.

Is grinding harmful to baby teeth?

Usually, no. Baby teeth are designed to fall out, and mild wear is not something we treat aggressively. What we do watch for:

• Flattened or shortened tooth tips

• Small chips along the biting edges

• Complaints of jaw soreness in the morning

• Sensitivity to cold foods that wasn't there before

Worn permanent teeth are a bigger concern than worn baby teeth. That's the whole distinction. Once adult teeth come in, we pay much closer attention.

When should I bring my child to the dentist?

Bring your child in sooner rather than later if any of the following apply:

• Grinding continues past age 6 or 7, when permanent teeth start erupting

• You see visible tooth wear, chips, or your child mentions sensitivity

• Your child complains of jaw pain or headaches in the morning

• You hear loud snoring, gasping, or pauses in breathing at night

That last one matters. Loud snoring in a young child isn't cute. It can be a sign of sleep-disordered breathing that deserves a proper evaluation. If we suspect it, we'll recommend an ENT or sleep specialist referral.

The American Academy of Pediatric Dentistry recommends dental visits every six months for children. Those routine visits are when we spot patterns early. A mom from Cerritos brought her 8-year-old in during a Saturday appointment last back-to-school season. She'd only booked because of a routine cleaning. We caught wear on his lower molars that matched her description of grinding sounds she'd been hearing for months. Simple to catch. Easy to monitor from there.

What can we do at home to help?

Most cases respond to environment and routine tweaks. Try these before assuming your child needs a dental appliance:

• Build a wind-down routine. Same bedtime. Same sequence. Predictability helps a nervous system settle.

• Limit screens and sugar in the hour before bed. Both keep the body activated.

• Try a warm bath and reading. Calm inputs. Dim lights.

• Talk about stress openly. Ask about school, friends, and worries. Sometimes just naming a fear helps a child sleep more deeply.

• Keep regular family checkups. This is how we track wear over time.

Most kids outgrow it. Truly.

How La Mirada One Dental evaluates and treats bruxism

When you bring your child in, here's what we actually do:

First, a visual exam. Dr. Park checks for wear patterns, chips, and how the upper and lower teeth meet. Next, we use our iTero digital scanner to document tooth surfaces. That gives us a baseline. Six months later, we can compare exact surfaces and see whether wear is progressing or stable.

If we suspect an airway issue, we'll suggest an ENT evaluation. For older children with permanent teeth and clear wear, a custom nightguard can protect the biting surfaces. Custom nightguards are typically not recommended for children with primary teeth because they can interfere with normal jaw growth, so we're careful about who actually needs one.

We know parents' schedules are tight. That's why we hold Saturday appointments from 8 AM to 1 PM, which works well for working parents from Cerritos, Norwalk, and Whittier who can't easily leave during the week.

Frequently Asked Questions

At what age do children usually stop grinding their teeth?

Most children outgrow bruxism by ages 9 to 12, once their permanent teeth have settled into a stable bite. Some stop much earlier, around age 6. If grinding continues into the teen years, it's worth an evaluation because the causes and treatment approach differ from those in younger kids.

Does my child need a nightguard?

Probably not if they still have mostly baby teeth. Custom nightguards can interfere with normal jaw growth in younger children. For older kids with permanent teeth showing clear wear, a custom-fit nightguard from our office can help. We'll never recommend one your child doesn't need.

Can teeth grinding cause permanent damage to baby teeth?

Rarely. Baby teeth are meant to fall out, and mild wear is usually not a functional problem. Severe grinding can cause chips or sensitivity, but even then treatment is often watchful monitoring rather than active repair. We track changes with digital scans at each visit.

Is nighttime grinding linked to sleep apnea in kids?

It can be. Research has associated sleep bruxism in children with sleep-disordered breathing, including enlarged tonsils and adenoids. If your child grinds and also snores loudly, breathes through their mouth, or seems tired despite full nights of sleep, mention it at their next visit. We may recommend an ENT or sleep evaluation.

Should I wake my child up when I hear them grinding?

No. Waking them disrupts sleep and doesn't stop the underlying cause. Instead, note how often it happens and mention it at your child's next dental visit. If grinding is loud and constant every night for weeks, or paired with breathing pauses, don't wait for the next checkup. Call us.

If you've been hearing your child grind at night and you're not sure whether to worry, we're happy to take a look. Call La Mirada One Dental at (562) 777-1234 or book online. We see families from La Mirada, Cerritos, Norwalk, Whittier, and beyond, and Saturday appointments are available for busy parents.