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Why Does My Child Have Two Rows of Teeth?

Dr. Jin Sup Shin, board-certified orthodontist at SmileWorks NYC
Smileworks Dentistry & Orthodontics
Reviewed By:
Dr. Jin Sup Shin
Last Updated: November 4, 2026

Your child likely has two rows of teeth because a permanent tooth is coming in behind a baby tooth that has not fallen out yet. Parents often call it “shark teeth,” and while the double row can look alarming in the bathroom mirror, it is a common stage of growing up.

At SmileWorks Dentistry & Orthodontics, we help families across Manhattan keep every stage of their kids’ smiles on track, and our pediatric dentistry team sees double rows regularly at our Midtown East office. We are a one-stop shop for the whole family, so you can have your child’s teeth checked, ask questions, and plan next steps in one friendly visit.

What Causes a Double Row of Teeth

Baby teeth usually leave on their own because the growing permanent tooth presses on the baby tooth’s root and dissolves it.

When the Adult Tooth Takes a Detour

Sometimes the adult tooth takes a different path. It may come in just behind the baby tooth, especially in the lower front teeth, so the baby tooth keeps its root and stays put for a while. The result is a temporary double row that often shows up in the early school years.

Think of the baby tooth as a placeholder holding a seat at the table. When the adult tooth arrives early or at a slight angle, it simply grabs the nearest open seat, and that is how two rows end up sharing one smile.

Why Regular Checkups Matter

This stage is part of what pediatric dentists call the mixed dentition period, when baby and adult teeth share the mouth. The American Academy of Pediatric Dentistry explains that early diagnosis and treatment of eruption problems can help children reach a stable, functional bite, which is why regular checkups matter so much.

What to Do When You Spot Shark Teeth

Take a deep breath, because most kids move through this stage without any trouble. Most children are more curious than worried, and your calm attitude sets the tone.

Give the Baby Tooth Time to Loosen

Many baby teeth loosen and fall out on their own, and the tongue often nudges the adult tooth forward into its proper spot. You can encourage your child to wiggle the baby tooth gently with clean fingers, and a little patience usually goes a long way. Keep brushing and flossing around both rows, since food and plaque can hide between crowded teeth.

Know When to Call Us

Sometimes the baby tooth needs a helping hand, and these are the signs we suggest watching for.

  • No loosening: the baby tooth stays firm for several weeks while the adult tooth keeps growing.
  • Discomfort: your child complains of soreness or has trouble chewing.
  • Swollen gums: the gums around the teeth look red or puffy.
  • Crowding: the adult tooth looks twisted or squeezed as it comes in.

If you notice any of these, our team can check the area and, if needed, help the baby tooth on its way. When a baby tooth needs to come out, we offer pediatric tooth extraction for children, so you never have to guess what comes next. If your child has not visited us yet, our pediatric first visit is a gentle way to start.

When Early Orthodontic Care Can Help

Most double rows sort themselves out, but they can sometimes point to a crowded mouth. If your child’s adult teeth look twisted or tight, an early check lets us plan ahead instead of waiting for problems to grow. Our guide on when a child should first see an orthodontist explains the best timing for that first visit. Early orthodontics is not about rushing treatment, because it is about timing.

A short checkup can show whether your child needs nothing at all or a simple plan to guide growth. Our early orthodontics care can guide jaw growth and make room for incoming teeth, which may mean simpler treatment later. Dr. Jin Sup Shin leads our orthodontic care, and families visit us from Central Park South, Chelsea, and Harlem for dental and orthodontic needs in one place.

Book Your Child’s First Visit With SmileWorks Dentistry & Orthodontics

Spotting a second row of teeth can feel like a surprise, but you do not have to figure it out alone. We are here to check on the new tooth, answer your questions, and keep your child comfortable and smiling. Our 3D X-ray machine, 3D scanner, and 3D printer help us see exactly what is happening beneath the gums, so every plan fits your child. You also leave with straightforward answers about what to do at home in the meantime.

Our award-winning team treats every patient like family, and we offer a free consultation along with help filing PPO insurance claims. Whether you live in Manhattan or nearby, we would love to meet your little one, so reach out to schedule your child’s visit today.

Dr. Jin Sup Shin, board-certified orthodontist at SmileWorks NYC
Dr. Jin Sup Shin
Dr. Shin is an orthodontist trained at New York University, where she earned her Bachelor of Science, Doctor of Dental Surgery, and completed her residency in Orthodontics and Dentofacial Orthopedics. Graduating in the top 2% of her class, she was inducted into Omicron Kappa Upsilon (OKU). Dr. Shin is also an adjunct assistant clinical professor at NYU and has published research in scientific journals.

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