“Shark teeth” is the informal term parents use when a permanent tooth erupts behind a baby tooth that hasn’t fallen out yet, creating two visible rows, much like a shark’s overlapping teeth. This most often happens with the lower front teeth around ages five to seven, and in most healthy children it reflects a normal, if slightly out-of-order, step in the transition from baby teeth to adult teeth.
Still, factors like the child’s age, how loose the baby tooth is, and whether there’s pain or swelling determine whether watching and waiting is appropriate or whether a dental visit is needed sooner.
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What Are Shark Teeth in Children?
Primary (baby) teeth are meant to loosen through a process called root resorption, in which the body gradually breaks down the baby tooth’s roots until it falls out on its own, typically nudged along by the incoming permanent tooth. With kids with shark teeth, the permanent tooth emerges on the tongue side of the baby tooth before that resorption process has caught up, so both teeth are visible at once for a period. According to the American Dental Association’s eruption charts, the lower central incisors are typically among the first permanent teeth to come in, right around the age this overlap tends to appear.
The classic lower-incisor pattern usually comes down to the permanent tooth’s normal tongue-side eruption path combined with primary-root resorption that simply hasn’t kept pace yet. Genetic factors, including family patterns in tooth size, jaw size, and eruption timing, can play a role, as can limited arch space or crowding, though crowding is not required for this to happen. Less commonly, prior trauma to the baby tooth, an obstruction such as a supernumerary tooth, or, rarely, a broader medical condition affecting several teeth can contribute.
“A baby tooth that remains in place long after its expected shedding time may involve a different issue, known as retained primary teeth, which should be evaluated separately.”
Is It Normal for a Child to Have Two Rows of Teeth?
Because eruption timing naturally varies between children, a temporary overlap is common, though not every case should be assumed normal without a closer look. Generally, if the baby tooth is loose and gradually loosening further, that’s reassuring. If it stays completely firm while the permanent tooth keeps emerging, or if there’s pain, swelling, or bleeding, that shifts the picture toward needing an evaluation rather than continued watching.
| What You Notice | What You Can Do at Home | When to Call a Dentist |
|---|---|---|
| A permanent tooth is visible behind a baby tooth, but the baby tooth is loose and your child feels well | Encourage gentle, child-led wiggling with clean hands. Continue normal brushing and flossing. | Mention it at the child’s next routine dental visit if it is continuing to loosen. |
| The baby tooth is still firm and the permanent tooth is continuing to come in | Do not try to pull the tooth out at home. Keep the area clean and schedule an evaluation. | Call for a non-urgent dental appointment, especially if the tooth has not started loosening. |
| The area is sore, red, swollen, or difficult to brush | Avoid irritating the area and maintain gentle oral hygiene. | Contact a dentist promptly to rule out irritation, infection, or an eruption problem. |
| There is facial swelling, fever, trouble swallowing, trouble breathing, uncontrolled bleeding, or significant trauma | Do not wait for a routine appointment. | Seek urgent dental or medical care. |
In most cases, the baby tooth loosens and falls out on its own within a few weeks to a few months as the permanent tooth continues to settle into place. Parents should never force or pull a tooth that’s still firmly attached, and tools like string or pliers should be avoided entirely. The ADA’s own consumer guidance on removing a loose tooth is direct on this point. Gentle, child-led wiggling is the safer path. If the baby tooth is already loose and the child is comfortable, wiggling is fine, but any pain, swelling, trauma, or signs of infection call for prompt evaluation rather than waiting it out. Otherwise, normal brushing, flossing, and the child’s usual dental care schedule can continue as guided by the treating dentist.
Will the Permanent Tooth Move Into Place?
In many kids with shark teeth, the permanent tooth gradually moves forward after the baby tooth falls out or is removed. The tongue naturally applies gentle pressure from behind, and the tooth may look more aligned over the following weeks or months. Shark teeth alone do not automatically mean a child will need braces.
However, a pediatric dentist may want to monitor the tooth more closely if there is significant crowding, the tooth is erupting at a pronounced angle, several teeth are affected, or the tooth does not appear to be settling after the baby tooth is gone. An examination can help distinguish a temporary eruption variation from a spacing or alignment concern.
When to Call a Pediatric Dentist
A dental visit is worthwhile if the baby tooth remains firm while the permanent tooth keeps emerging, if there’s persistent retention past the expected window, or if the child experiences pain, bleeding, swelling, fever, difficulty biting, or a permanent tooth coming in at an unusual angle. Seek urgent dental or medical care if a child has difficulty breathing or swallowing, rapidly spreading swelling in the face or neck, uncontrolled bleeding, or significant facial trauma.
If your child is showing signs of shark teeth, the pediatric dentists at Kakar Dental Group can evaluate the eruption pattern and recommend next steps, whether that’s simple monitoring or a closer look with X-rays.
Frequently Asked Questions About Shark Teeth in Kids
Are shark teeth in kids normal?
Do shark teeth mean my child will need braces?
Can shark teeth happen on the top teeth too?
