If you’ve noticed an adult tooth growing in behind your child’s baby tooth, you’re not alone. This phenomenon—often called “shark teeth” by parents—can look alarming at first. Fortunately, in many cases, it’s a completely normal part of children’s tooth development known as mixed dentition, when baby teeth and permanent teeth are both present as a child’s smile transitions.
Most often, this happens because the permanent tooth begins erupting before the baby tooth has become loose enough to fall out. As the adult tooth continues to come in, it often helps dissolve the baby tooth’s root, allowing the baby tooth to loosen and eventually fall out naturally.
During this stage, a pediatric dentist will evaluate several factors, including your child’s eruption timing, the position of the permanent tooth, the mobility of the baby tooth, available spacing, and overall jaw development. These details help determine whether the teeth are following a healthy eruption pattern or if additional treatment may be needed.
At Great Grins Children’s Dentistry, we reassure parents every day that many cases of permanent teeth coming in behind baby teeth resolve on their own with time. However, some situations benefit from professional evaluation and, occasionally, intervention to help permanent teeth erupt into their proper position. Understanding the difference can help you know when to simply monitor your child’s smile and when it’s time to schedule a visit with your pediatric dentist.
What Are “Shark Teeth” in Children?
The term “shark teeth” isn’t a medical diagnosis—it’s simply the nickname parents often use when they notice a second row of teeth forming behind their child’s baby teeth. While it can be surprising to see an adult tooth erupt before the baby tooth has fallen out, this is actually a fairly common part of pediatric tooth eruption.
In most cases, shark teeth occur because a permanent tooth begins emerging before the primary tooth is ready to come out. Instead of erupting directly beneath the baby tooth, the new tooth appears just behind it, creating the appearance of two rows of teeth. Although this can look unusual, it’s often a normal stage in the transition from baby teeth to permanent teeth.
Why Permanent Teeth Sometimes Come in Behind Baby Teeth
As children grow, the roots of their baby teeth gradually dissolve through a natural process called root resorption. This allows the baby teeth to become loose and eventually fall out, making room for the permanent teeth underneath.
Sometimes, however, the timing isn’t perfectly synchronized. A permanent tooth may begin erupting before the baby tooth has become loose enough to fall out. As the adult tooth continues to emerge, it often stimulates further root resorption, causing the baby tooth to loosen and shed naturally over the following weeks or months. This slight variation in eruption timing is common and is usually considered a normal part of the tooth replacement process.
Which Teeth Most Commonly Develop Shark Teeth?
Shark teeth are seen most often in the lower front teeth, typically around ages 6 to 7 when the first permanent incisors begin to erupt. It’s also fairly common for the upper front teeth to follow a similar pattern a year or two later.
These teeth are among the first permanent teeth to replace baby teeth, making this stage of mixed dentition one of the most noticeable for parents. While every child follows their own timeline, this eruption pattern is generally expected and doesn’t automatically indicate a problem. A pediatric dentist can evaluate whether your child’s teeth are developing according to a healthy eruption sequence or if additional monitoring or treatment is recommended.
Why Does This Happen?
Although shark teeth may look unusual, they’re typically the result of a normal biological process that doesn’t always happen on a perfectly predictable timeline. The transition from baby teeth to permanent teeth involves carefully coordinated changes beneath the gums, and even small variations in timing or positioning can affect how new teeth erupt.
How Baby Tooth Roots Naturally Dissolve
Baby teeth don’t simply “fall out” on their own. As a permanent tooth begins developing beneath the gums, it triggers a natural process called root resorption, in which specialized cells gradually dissolve the roots of the primary tooth.
As those roots become shorter, the baby tooth loses its support and becomes loose enough to wiggle free. Ideally, this happens just as the permanent tooth is ready to emerge, allowing it to take the baby tooth’s place. However, every child develops at their own pace, so the timing isn’t always perfectly synchronized.
What Happens When Baby Teeth Don’t Become Loose Soon Enough
Sometimes, the permanent tooth begins erupting before the baby tooth has lost enough of its root structure to become loose. Instead of pushing the baby tooth out immediately, the new tooth may follow the path of least resistance and emerge just behind it.
There are several reasons this can happen. Some children simply experience delayed exfoliation, meaning their baby teeth remain in place a little longer than average. Genetics can influence eruption timing, and the angle at which a permanent tooth develops may also affect where it appears. In many cases, these variations are simply part of normal development and resolve without treatment.
Can Jaw Size or Tooth Crowding Contribute?
Yes. Limited space in the jaw can sometimes influence the path a permanent tooth takes as it erupts. If there’s not enough room for the new tooth to come in directly beneath the baby tooth, it may emerge behind it instead.
Crowding doesn’t always mean orthodontic treatment will be necessary, but it is one reason pediatric dentists carefully monitor children’s developing smiles. During routine exams, they evaluate tooth spacing, jaw growth, and eruption patterns to identify potential concerns early. If crowding or bite development becomes an issue, your pediatric dentist can determine whether continued observation is appropriate or if a referral to an orthodontist is recommended as your child grows.
When Shark Teeth Are Completely Normal
Seeing two rows of teeth can certainly catch parents off guard, but it’s important to remember that shark teeth are often a normal part of healthy dental development. In many cases, the permanent tooth is simply arriving a little earlier than the baby tooth is ready to leave. With a bit of time, the baby tooth loosens, falls out naturally, and the permanent tooth gradually shifts into a better position as the tongue, lips, and surrounding tissues help guide its alignment.
Normal Mixed Dentition During Childhood
Children typically enter the mixed dentition stage around age 6, when they have both baby teeth and permanent teeth in their mouths at the same time. This transitional period continues for several years as baby teeth are gradually replaced by adult teeth.
Because teeth don’t all erupt on the same schedule, it’s perfectly normal for some permanent teeth to appear while nearby baby teeth are still present. Every child’s eruption timeline is slightly different, and small variations are usually nothing to worry about. Regular visits to a pediatric dentist help ensure your child’s teeth are developing as expected throughout this important stage.
Signs the Baby Tooth Will Fall Out Naturally
One of the most reassuring signs is that the baby tooth is already becoming loose. As root resorption continues, you’ll often notice increasing mobility over the course of several days or weeks, even if the permanent tooth has already started to emerge behind it.
It’s also encouraging when the permanent tooth is erupting in the general direction of its intended position. As the baby tooth falls out and more space becomes available, many permanent teeth naturally drift into better alignment on their own. While it’s important to continue monitoring the area, these are all positive signs that the normal tooth replacement process is progressing as it should.
When Parents Should Schedule a Pediatric Dental Evaluation in Tucson
While many cases of shark teeth resolve naturally, it’s still a good idea to have your child’s smile evaluated if you’re unsure whether everything is progressing as expected. A pediatric dentist can determine whether the eruption pattern is healthy or if your child would benefit from treatment. In most cases, these visits provide reassurance—and if intervention is needed, addressing concerns early often leads to the simplest solutions.
Baby Tooth Isn’t Loose After Several Weeks
If the permanent tooth has been visible for several weeks and the baby tooth still isn’t loose, it’s worth scheduling an evaluation. Your pediatric dentist can assess whether the primary tooth is likely to fall out on its own or if it may need to be removed to allow the permanent tooth to continue erupting properly.
Permanent Tooth Continues Moving Into the Wrong Position
As permanent teeth erupt, they often shift into better alignment once the baby tooth falls out. However, if the new tooth continues moving farther behind the baby tooth or appears to be erupting significantly out of position, a pediatric dentist should examine the area.
At Great Grins Children’s Dentistry, we evaluate tooth positioning, spacing, and overall jaw development to determine whether continued monitoring is appropriate or if additional treatment should be considered. Early evaluation can help support healthy orthodontic development as your child’s smile continues to grow.
Pain, Swelling, or Difficulty Eating
Shark teeth themselves don’t usually cause significant discomfort. However, if your child experiences persistent pain, swelling, bleeding that doesn’t improve, or difficulty chewing because of the affected area, it’s important to schedule a dental visit.
Although infection is not a common cause of permanent teeth erupting behind baby teeth, these symptoms deserve professional evaluation to rule out other dental concerns and ensure your child’s mouth is healing and developing properly.
What a Pediatric Dentist Will Check During the Appointment
If your child develops shark teeth, a dental evaluation is usually quick, gentle, and focused on gathering information—not rushing into treatment. In many cases, the appointment simply confirms that your child’s teeth are developing normally and that the best next step is continued observation. If treatment is recommended, your pediatric dentist will explain why and answer any questions you have before moving forward.
Evaluating Tooth Mobility
One of the first things your pediatric dentist will check is how loose the baby tooth has become. Even if it doesn’t feel very mobile at home, a clinical exam can help determine whether it’s nearing the point where it will fall out naturally.
If the baby tooth is already loosening as expected, your dentist may simply recommend giving it more time while continuing to monitor your child’s progress.
Checking Eruption Position
Next, your pediatric dentist will evaluate where the permanent tooth is erupting and whether it’s following a healthy path. They’ll also look at the amount of available space, how the surrounding teeth are developing, and whether the new tooth is likely to move into a better position after the baby tooth is lost.
If needed, dental X-rays may be recommended to provide a clearer picture of how the permanent teeth are developing beneath the gums and to identify any concerns that aren’t visible during the clinical exam.
Determining Whether Extraction Is Necessary
If the baby tooth isn’t becoming loose and is preventing the permanent tooth from erupting properly, your pediatric dentist may recommend removing the primary tooth. This is often a simple procedure that creates the space needed for the permanent tooth to continue moving into its proper position.
Fortunately, extraction isn’t necessary for every child. Many cases of shark teeth simply require periodic monitoring until the baby tooth falls out naturally. At Great Grins Children’s Dentistry, we take a conservative, individualized approach to care, recommending treatment only when it’s truly in your child’s best interest.
What Parents Should (and Shouldn’t) Do at Home
If your child develops shark teeth, there’s usually no need to panic or take immediate action. The best approach is often to monitor the area, encourage good oral hygiene, and let the natural tooth replacement process continue. If you’re ever unsure about what you’re seeing, your pediatric dentist can provide guidance based on your child’s specific stage of development.
Encourage Gentle Wiggling if Recommended
If the baby tooth has already started to loosen, your pediatric dentist may recommend encouraging your child to gently wiggle it with clean fingers or their tongue. This natural movement can help the remaining root dissolve and allow the tooth to fall out on its own.
There’s no need to force the process—a little gentle movement over time is usually all that’s needed.
Avoid Pulling Teeth Too Early
It can be tempting to remove a baby tooth as soon as you notice a permanent tooth growing behind it, but pulling a tooth before it’s ready can be painful and may cause unnecessary bleeding or damage to the surrounding tissues.
Unless your pediatric dentist recommends otherwise, it’s best to let the tooth loosen naturally. If it doesn’t become mobile after several weeks or you’re concerned about how the permanent tooth is erupting, schedule an evaluation instead of trying to remove the tooth at home.
Maintain Excellent Oral Hygiene During Tooth Eruption
When both baby teeth and permanent teeth are present, it’s especially important to keep the area clean. Two rows of teeth can create extra spaces where food particles and plaque collect, increasing the risk of cavities and gum irritation.
Help your child brush thoroughly twice a day with fluoride toothpaste, paying close attention to the teeth that are erupting. Daily flossing and regular dental checkups also play an important role in keeping your child’s smile healthy throughout the mixed dentition stage.
Frequently Asked Questions
Will shark teeth straighten themselves?
Often, yes. Once the baby tooth falls out, many permanent teeth naturally drift into a better position over time. This is especially common when there is enough space in the jaw and the permanent tooth is erupting in the correct general direction. However, every child develops differently, so it’s important to have your pediatric dentist monitor the eruption pattern. If there are concerns about spacing, crowding, or jaw development, they can recommend the most appropriate next steps while your child’s smile continues to grow.
Should I pull the baby tooth myself?
In most cases, no. Even if a permanent tooth has already erupted behind it, a baby tooth should only come out when it’s ready. Trying to remove it too early can cause unnecessary pain, bleeding, or injury to the surrounding tissues. If the tooth is already very loose, your child may be able to gently wiggle it free on their own. If it remains firmly in place after several weeks or you’re concerned about how the permanent tooth is erupting, it’s best to schedule an evaluation with your pediatric dentist.
Are shark teeth painful?
Shark teeth themselves are not usually painful. Some children may notice mild tenderness or pressure as permanent teeth erupt, but many experience little to no discomfort. If your child develops significant pain, swelling, persistent bleeding, or difficulty chewing, those symptoms may indicate another dental issue that should be evaluated. Although complications are uncommon, it’s always a good idea to contact your pediatric dentist if your child’s symptoms seem more severe than expected.
Can shark teeth cause braces later?
Not necessarily. Having shark teeth does not automatically mean your child will need orthodontic treatment. In many cases, the permanent tooth moves into a more normal position after the baby tooth falls out. However, if shark teeth are related to crowding or limited space in the jaw, those same factors could increase the likelihood of orthodontic treatment in the future. Regular visits with a pediatric dentist allow your child’s developing bite to be monitored so potential concerns can be identified early.
Is this considered a dental emergency?
In most situations, no. Shark teeth are typically a normal variation of the tooth eruption process and do not require emergency treatment. However, you should contact your pediatric dentist if your child has severe pain, swelling, signs of infection, difficulty eating, or if the affected area was injured in an accident. Otherwise, scheduling a routine evaluation is usually the best way to determine whether the teeth are developing normally or if any treatment is needed.
Schedule a Pediatric Dental Evaluation in Tucson
If you’ve noticed your child’s permanent teeth growing behind their baby teeth or you’re concerned about delayed tooth loss, you don’t have to figure it out on your own. While shark teeth are often a normal part of childhood development, a professional evaluation can provide reassurance and help ensure your child’s teeth are erupting as they should.
At Great Grins Children’s Dentistry, we carefully evaluate eruption timing, tooth position, jaw development, and overall oral health to determine whether your child’s smile simply needs time or if treatment is recommended. Early assessment can often prevent more complex orthodontic concerns later while giving your family confidence that your child’s dental development is on the right track.
If you have questions about your child’s tooth eruption or would like the peace of mind that comes with an expert evaluation, contact Great Grins Children’s Dentistry today to schedule an appointment. We’re proud to help families throughout Tucson navigate every stage of their child’s growing smile.
