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Shark Teeth in Kids: What They Are, Why They Happen, and What to Do
Shark teeth in kids are exactly what they sound like — a double row of teeth, where a permanent tooth erupts behind a baby tooth that hasn't fallen out yet.
It looks a little alarming the first time you notice it, but here's the reassuring truth: shark teeth are one of the most common things pediatric dentists see, they affect roughly 1 in 10 children, and in the majority of cases they resolve completely on their own without any treatment.
The name comes from sharks, which famously grow multiple rows of teeth — and while your child is not turning into a shark, the visual comparison is pretty accurate.
This guide explains exactly what causes shark teeth, when they happen, what you should do at home, and when it's time to call your pediatric dentist.
If you've noticed a tooth growing behind your child's baby tooth specifically, here's a detailed guide for parents on what to expect.
What Are Shark Teeth?
The dental term for shark teeth is ectopic eruption — when a permanent tooth erupts in the wrong position, typically behind the baby tooth it was supposed to replace rather than directly beneath it. Instead of one row of teeth, your child temporarily has two: the original baby tooth still in place, and the new permanent tooth coming in behind it.
Shark teeth most commonly appear in the lower front teeth, but they can also occur in the upper front teeth and in the back of the mouth when the molars come in. In most cases, the double row is temporary — once the baby tooth falls out, the permanent tooth moves forward naturally into its correct position.
What Causes Shark Teeth in Kids?
Under normal circumstances, when a permanent tooth begins developing beneath a baby tooth, it gradually dissolves the roots of the baby tooth above it. As the roots dissolve, the baby tooth loosens and eventually falls out — making room for the permanent tooth to erupt directly in its place.
Shark teeth happen when this process doesn't go as planned. There are two main reasons:
- The permanent tooth erupts at a slight angle. Instead of pushing directly upward into the root of the baby tooth, it comes in at an angle that misses the root entirely. Without root resorption, the baby tooth stays firmly in place and the permanent tooth has no choice but to erupt behind it.
- The baby tooth roots don't dissolve properly. Sometimes the roots of the primary tooth are unusually stubborn and don't resorb on schedule even when the permanent tooth is coming in at the correct angle. The permanent tooth pushes through wherever it can — which is often behind the baby tooth.
In either case, the result is the same: two rows of teeth, one in front of the other.
Shark teeth are one of several ways that teeth can erupt unexpectedly. Learn more about baby teeth coming in out of order and what it means for your child's development.
When Do Shark Teeth Most Commonly Appear?
Shark teeth tend to cluster around two key periods of dental development.
The first is around age 5–7, when the lower central incisors begin erupting. This is the most common time for shark teeth to appear — many parents notice it during the kindergarten or first-grade years. The lower front teeth are the most frequent site of ectopic eruption.
The second window is around age 10–13, when the upper and lower back premolars and second molars begin coming in. Shark teeth at this stage are less visible than front-tooth shark teeth but just as common.
Should You Be Worried?
In most cases, no. Shark teeth are a normal variation in dental development and not a sign that anything is seriously wrong. The vast majority resolve without any intervention — once the baby tooth falls out, on its own or with a little help, the permanent tooth moves forward naturally.
That said, there are situations where a call to your pediatric dentist is the right move, and we cover those in detail below.
What to Do If Your Child Has Shark Teeth
Step 1 — Check if the Baby Tooth Is Loose
The first thing to do when you notice shark teeth is gently check whether the baby tooth is loose. Ask your child to wiggle it with their tongue.
If the tooth is loose, encourage your child to wiggle it regularly throughout the day. Most loose baby teeth in shark-teeth situations fall out within a few weeks, after which the permanent tooth will migrate forward on its own. No dental visit is needed in most cases.
If the tooth is not loose at all, move to Step 2.
Step 2 — Give It 2–4 Weeks
If the baby tooth is firmly in place when you first notice the shark teeth, give it a little time. In many cases, the baby tooth will begin to loosen as the permanent tooth continues to erupt and pressure builds. Check weekly and continue encouraging your child to wiggle it.
Step 3 — Call Your Pediatric Dentist If the Tooth Doesn't Budge
If the baby tooth remains completely firm after 2–4 weeks — or if your child complains of pain or difficulty chewing — it's time to book an appointment. Your pediatric dentist will examine the baby tooth and the erupting permanent tooth, take X-rays to assess the root structure, and recommend extraction of the baby tooth if needed.
Baby tooth extraction for shark teeth is a quick, simple procedure. It's done under local anesthesia, takes just a few minutes, and is one of the most routine things a pediatric dentist does. After the baby tooth is removed, the permanent tooth typically moves forward into its correct position within a few months — guided naturally by the tongue.
Will the Permanent Tooth Straighten Out on Its Own?
This is the question every parent asks — and the answer is usually yes, but it depends on where the permanent tooth is sitting and your child's age.
Lower front teeth have the best self-correction record. Once the baby tooth is out, the tongue exerts natural pressure that pushes the permanent tooth forward. In the majority of cases — especially in younger children — the tooth moves to a normal position without any orthodontic intervention.
Upper front teeth are slightly less predictable. The upper arch has less natural tongue pressure pushing teeth forward, so upper shark teeth may be more likely to need monitoring or orthodontic guidance.
Back teeth need closer monitoring, as the eruption path of premolars and molars is more complex. Your pediatric dentist will track these on X-rays.
If the permanent tooth doesn't fully self-correct, orthodontic treatment later in childhood can address any residual spacing or alignment issues.
Can Shark Teeth Cause Problems If Left Untreated?
If the baby tooth remains in place for an extended period while the permanent tooth erupts behind it, a few issues can develop.
Crowding is the most common concern — the permanent tooth may not have enough room to move into correct alignment. Two rows of teeth also create extra surfaces and tight spaces where plaque accumulates, increasing cavity risk. In some cases, an ectopically erupted tooth that isn't addressed can affect how the upper and lower teeth come together.
This is why the 2–4 week monitoring approach matters. Most cases resolve quickly, but prolonged double rows warrant professional evaluation.
Two rows of teeth also create extra surfaces and tight spaces where plaque accumulates, increasing cavity risk. Here's how to protect your child from cavities during this phase.
Shark Teeth at the Back of the Mouth
Shark teeth at the back of the mouth — involving the first permanent molars around age 6 or the second molars around age 12 — are handled slightly differently. When back molars erupt ectopically, they can sometimes erupt partially under the adjacent tooth, which requires professional assessment sooner rather than later.
If you notice unusual bumps, swelling, or your child complaining of discomfort at the back of their mouth during molar eruption, have it evaluated promptly.
Tips for Parents: How to Help at Home
- Encourage wiggling — make it a daily habit. Wiggling a loose baby tooth speeds up root resorption and helps it fall out faster.
- Let them pull it — if the baby tooth is very loose, letting your child gently pull it out is perfectly safe and effective. Here's how to pull a loose tooth safely.
- Keep the area clean — brush carefully around both rows of teeth and floss between them. The gap between the baby and permanent tooth can trap food and plaque easily.
- Don't panic — shark teeth look dramatic but are almost always benign. Your child is not going to have two permanent rows of teeth. This is a temporary phase of development.
- Don't try to pull a firm tooth — if the baby tooth isn't loose, don't attempt to force it out at home. A firmly rooted baby tooth requires professional extraction — trying to pull it at home can be painful and cause injury.
When to Call Your Pediatric Dentist
Contact your pediatric dentist if the baby tooth is completely firm after 4 or more weeks of shark teeth being present, your child is experiencing pain or discomfort, the permanent tooth appears to be erupting very far out of position, you notice shark teeth at the back of the mouth, or you have any doubt about whether the situation is resolving normally. When in doubt, a quick check-up gives you peace of mind and ensures your child's dental development is on track.
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Frequently Asked Questions
What are shark teeth in kids?
Shark teeth in kids refer to a double row of teeth — where a permanent tooth erupts behind a baby tooth that hasn't fallen out yet. The dental term is ectopic eruption. It's one of the most common variations in childhood dental development and affects roughly 1 in 10 children.
What causes shark teeth in children?
Shark teeth happen when a permanent tooth erupts at a slight angle that misses the root of the baby tooth above it, or when the baby tooth's roots don't dissolve on schedule. Without root resorption, the baby tooth stays in place and the permanent tooth erupts behind it instead of directly replacing it.
When do shark teeth appear in kids?
Shark teeth most commonly appear in two windows: around age 5–7, when the lower front permanent teeth erupt, and around age 10–13, when the back premolars and second molars come in. The lower front teeth are the most frequent site.
Do shark teeth fix themselves?
In the majority of cases, yes. Once the baby tooth falls out — on its own or with gentle encouragement — the permanent tooth moves forward naturally into the correct position, guided by tongue pressure. Lower front shark teeth have especially good self-correction outcomes.
Should I take my child to the dentist for shark teeth?
If the baby tooth is loose, you can monitor at home and encourage wiggling. If the baby tooth remains completely firm after 2–4 weeks, or your child is in pain, schedule a visit with your pediatric dentist. They can assess whether a simple extraction is needed to clear the way for the permanent tooth.
Is shark teeth painful for kids?
Shark teeth are usually not painful. Some children notice pressure or mild discomfort as the permanent tooth erupts, but significant pain is not typical. If your child is complaining of notable pain, contact your pediatric dentist.
Can shark teeth cause permanent alignment problems?
Most shark teeth resolve without lasting alignment issues. In cases where the permanent tooth doesn't fully self-correct after the baby tooth is removed, orthodontic treatment can address any residual spacing or positioning concerns.
How do I help my child's shark tooth fall out?
Encourage your child to wiggle the baby tooth with their tongue throughout the day. If it's very loose, gentle pulling is safe. Never try to forcibly remove a firmly rooted tooth at home — if the tooth isn't loose, contact your pediatric dentist for a professional evaluation.
