Noticing a new tooth peeking up behind your child’s baby tooth can be startling. If you’ve been asking, “Why is my child’s permanent tooth growing behind the baby tooth?” plenty of parents in Fairhope, AL ask the same thing. This double-row appearance is so common that families and dental teams often call it “shark teeth.” In most cases, it’s a normal part of growing up. At Fairhope Children’s Dentistry, our team helps families understand what’s happening and what to do next.
Quick answer: Shark teeth happen when a permanent tooth erupts behind a baby tooth that hasn’t fallen out yet. Normally the adult tooth dissolves the baby tooth’s root, but when that root doesn’t fully break down, the baby tooth stays put while the new tooth comes in behind it. It’s usually a normal, temporary stage.
What Are “Shark Teeth”? (Permanent Teeth Behind Baby Teeth)
“Shark teeth” is the nickname for a permanent tooth that erupts behind a baby tooth that hasn’t fallen out yet, creating a visible second row. The medical term is ectopic eruption. It’s most common between ages 5 and 7, usually with the lower front teeth, and it’s typically a normal, temporary phase of dental development.
The nickname comes from the appearance of two rows of teeth at once, similar to a shark’s mouth. While it can look concerning to parents, it usually doesn’t signal anything serious. The baby tooth is simply hanging on longer than expected while the adult tooth continues its natural path upward. With a little attention and time, most children move through this stage smoothly.
What Causes Adult Teeth to Grow Behind Baby Teeth?
Normally, as a permanent tooth develops beneath a baby tooth, it presses upward and slowly dissolves the baby tooth’s root. This process, called root resorption, is what makes baby teeth feel loose and eventually fall out. When resorption doesn’t happen fully, the baby tooth stays firmly rooted while the permanent tooth finds another way to erupt, often just behind it.
Several factors can lead to this pattern:
- Incomplete root resorption. The baby tooth’s root doesn’t dissolve on schedule, so it stays anchored in place.
- Eruption path variation. The permanent tooth develops slightly behind the baby tooth and follows that angle upward.
- Crowding or limited space. A smaller jaw or tight spacing can redirect where the new tooth emerges.
- Genetics. Family patterns of tooth development, jaw size, and eruption timing all play a role.
None of these causes reflect anything you did or didn’t do as a parent. Shark teeth are simply a variation in how permanent teeth come in. Our board certified pediatric team sees it regularly in healthy, growing children across Fairhope, and it’s rarely a cause for real worry.
Signs Your Child Has Shark Teeth and Why Early Attention Helps
Recognizing shark teeth early makes the process easier for everyone. The signs are usually easy to spot once you know what to look for, and a quick check at home can help you decide whether to schedule a visit.
Common signs include:
- A visible second row of teeth, most often behind the lower front teeth
- A baby tooth that feels loose but won’t fully come out
- A permanent tooth that’s already partially or fully visible behind the baby tooth
- Your child mentioning pressure, tenderness, or an odd feeling in that spot
- Difficulty biting comfortably in that area
Early attention helps for a few reasons. Monitoring the area lets our team confirm the permanent tooth is coming in correctly. It also helps prevent long-term alignment concerns if the baby tooth stays too long. Here’s what puts many parents at ease: plenty of cases resolve on their own once the baby tooth wiggles free, and gentle guidance is often all that’s needed.
Normal Eruption vs. Shark Teeth: When It Resolves Itself vs. Needs Care
Understanding the difference between a typical eruption pattern and shark teeth (permanent teeth growing behind baby teeth) helps you know when to wait and when to reach out. Here’s a side-by-side look at what’s usually normal and what may need a closer look from our team.
| Feature | Normal Eruption | Shark Teeth (Ectopic Eruption) |
|---|---|---|
| Baby tooth | Becomes loose, then falls out | Stays firm even as adult tooth appears |
| Adult tooth position | Erupts in the same spot | Erupts behind the baby tooth |
| Timeline | Baby tooth falls out within days to a few weeks of loosening | Baby tooth may remain in place for weeks longer |
| Appearance | One row of teeth at a time | Two rows visible temporarily |
| Action needed | Usually none | May self-resolve or need a gentle visit |
Cases that often resolve on their own
If the baby tooth is already wiggly and the permanent tooth is just starting to peek through, the situation frequently sorts itself out within a couple of weeks. Encouraging your child to gently wiggle the loose baby tooth during normal daily activities can help.
Cases that may need care
If the baby tooth stays firm while the permanent tooth continues to grow in, or if two full weeks pass without progress, it’s a good time to schedule a visit. A short evaluation gives our team the chance to check the area and guide the next step.
Risks of Leaving Shark Teeth Untreated
Most shark teeth situations resolve without concern, but ignoring one that lingers can create small issues that are easier to address early. Here’s what can happen if a stubborn baby tooth is left in place too long:
- Crooked eruption. The permanent tooth may continue to grow into its offset position, affecting alignment.
- Trapped plaque and decay. Two rows of teeth are harder to brush thoroughly, so bacteria and food can build up around the retained baby tooth.
- Crowding concerns. A baby tooth that stays too long can influence how nearby permanent teeth come in.
- Gum irritation. The retained baby tooth may become tender or cause soreness as the permanent tooth pushes upward.
- Delayed self-correction. The tongue naturally helps guide a new tooth forward once space opens, but only after the baby tooth is out.
Thankfully, most of these concerns are easily avoided with a timely evaluation. A short visit lets our team decide whether waiting a little longer or a gentle extraction is the best next step for your child’s growing smile.
When to Schedule a Pediatric Dental Evaluation
If your child has shark teeth, it’s usually safe to give the baby tooth a couple of weeks to loosen naturally. If nothing changes, that’s the right moment to schedule a visit at our Fairhope, AL office.
Consider scheduling sooner if you notice any of the following:
- The baby tooth hasn’t loosened after 2 to 3 weeks
- The permanent tooth is fully visible behind the baby tooth
- Your child mentions tenderness, pressure, or difficulty chewing
- The area looks red, swollen, or irritated
- You’re simply unsure and want reassurance
What to expect at the visit
Our team, which includes Dr. Elizabeth Clay, DDS, Dr. Katherine Rodriguez-Feo, DMD (a Board Certified Pediatric Dentist), and Dr. Kelly Jones, DMD, will gently examine the area and take a digital X-ray if needed to see how the permanent tooth is positioned. If the baby tooth won’t budge on its own, a quick, gentle extraction is often all it takes. Every step is explained ahead of time so your child feels informed and comfortable.
Frequently Asked Questions About Shark Teeth in Children
How common are shark teeth in young children?
Shark teeth are very common, especially between ages 5 and 7 when the lower front baby teeth are being replaced. Our team sees this pattern regularly among families in Fairhope, and it’s considered a normal variation in how permanent teeth erupt. If you’ve noticed it in your child’s smile, there’s rarely reason to worry.
At what age do permanent teeth usually erupt?
The first permanent teeth typically start erupting between ages 6 and 7, usually the lower front teeth and the first molars. Every child develops at their own pace, so it’s not unusual for permanent teeth to arrive a bit earlier or later. Regular dental visits help our team track eruption patterns and catch any concerns early.
Will the baby tooth fall out on its own?
In many cases, yes. If the baby tooth is already loose, gentle wiggling during meals and brushing often helps it come out within a couple of weeks. If the baby tooth stays firmly in place while the permanent tooth continues to grow in, a short visit to our practice can help decide whether a gentle extraction is the right choice.
Should I wiggle or pull the baby tooth?
Gentle wiggling by your child is fine and can help a loose tooth come out naturally. We don’t recommend forcing or pulling a tooth that isn’t ready, since this can be uncomfortable and may cause bleeding. If the tooth won’t budge with normal wiggling, it’s best to let our team take a look.
Does the permanent tooth move forward after the baby tooth is gone?
Often, yes. Once the baby tooth is out of the way, the tongue naturally nudges the permanent tooth forward into its proper position over the following weeks and months. This self-correction is one reason early evaluation is helpful, since removing a stubborn baby tooth allows the new tooth to settle where it belongs.
Is it uncomfortable for my child?
Most children feel little to no discomfort from shark teeth themselves. Some mention mild pressure or tenderness, especially when the baby tooth is loose or the permanent tooth is pushing through. If your child seems bothered by the area, a gentle evaluation can rule out anything more and offer peace of mind.
If your child has a permanent tooth growing in behind a baby tooth, our team at Fairhope Children’s Dentistry is here to take a look and guide you through the next step. We’ll help you understand what’s happening and, if needed, provide gentle care to keep your child’s smile on track. Schedule a visit whenever you’re ready, we’re happy to help families in Fairhope, AL feel confident about every stage of their child’s growing smile.
