You are brushing your six-year-old’s teeth; they open wide, and there it is: a second row of teeth coming in behind the baby teeth, like a tiny shark. Take a breath. In almost all cases, this is normal; it is common, and it usually sorts itself out without any treatment at all. The grown-up tooth simply showed up before the baby tooth got around to leaving. Here is what is happening, what you can do at home, and the few situations where it is worth booking a visit.
What shark teeth actually are
Dentists call this ectopic eruption, which is a fancy way of saying a tooth came in somewhere other than its usual spot. Normally, a permanent tooth pushes up directly beneath its baby tooth. That pressure slowly dissolves the baby tooth’s root, the baby tooth gets wiggly, the tooth fairy gets paid, and the adult tooth slides into the empty space. The Canadian Dental Association’s dental development guide notes that children typically start losing baby teeth around age six, which is exactly when this little plot twist tends to appear.
Sometimes the timing goes off script. The baby tooth’s root does not dissolve on schedule, so it stays firmly put while the permanent tooth keeps coming anyway. With its usual path blocked, the new tooth erupts where it can, which is usually just behind the baby tooth. The result is that startling double row. Pediatric dental teams like the one at Nationwide Children’s Hospital field this question so often that shark teeth have a permanent spot in their parent resources. It happens most often with the lower front teeth around ages five to seven, right when kids are losing their first teeth anyway, though it can also show up in the upper front teeth or, later, near the back molars.
Why it happens
Usually, it is nothing anyone did or did not do. The most common reason is simply that the baby tooth root did not dissolve as expected. Crowding can play a part too. Adult teeth are bigger than the baby teeth they replace, and in a snug little jaw the new tooth may not have a clear runway, so it detours behind. Genetics and the position of the developing tooth can also be factors. None of it is caused by thumb sucking, sippy cups, or anything on your parenting conscience.
What to do at home
Check whether the baby tooth in front of the new arrival is loose. If it wiggles even a little, you are probably watching the normal process, just slightly out of order. Encourage your child to wiggle that tooth with a clean finger or their tongue several times a day. In most cases, the baby tooth loosens and falls out on its own within a few weeks, and here is the reassuring part: once the space opens up, the tongue naturally presses the new tooth forward into its proper spot over time. Many parents are amazed at how a tooth that came in behind the row ends up lining up on its own.
In the meantime, keep brushing carefully around both rows. Food and plaque like to hide between doubled-up teeth, so a gentle, thorough brush morning and night matters a bit more than usual.
When to call the dentist
Book a visit if the baby tooth is not loose at all and the adult tooth is well on its way in, if things have not changed after about a month of wiggling, if your child has pain or swelling, or if the shark tooth is an upper front tooth, since those sometimes need a little more help finding their way. Also come in if you simply want peace of mind. Reassuring worried parents is a big part of what we do, and no one here will ever think you overreacted.
At a visit, Dr. Leila Raziee will look and, if needed, a quick X-ray to see what is happening under the gums: how much of the baby tooth root remains and where the permanent tooth is headed. Most of the time the plan is simply to monitor. If the baby tooth is truly refusing to budge, removing it is a small, quick procedure, and we have gentle comfort options for wiggly patients. If crowding appears to be a bigger concern in your child’s mouth, we may suggest keeping an eye on spacing as more adult teeth arrive. Having orthodontics for kids under the same roof means our orthodontist can weigh in early without a referral runaround, and a first orthodontic look by about age seven lines up neatly with shark tooth season.
Frequently asked questions
Does a shark tooth hurt?
Usually not. Most kids do not feel much beyond the normal wiggly-tooth sensation. Pain, swelling, or trouble chewing are exceptions and warrant a visit.
Will the adult tooth be crooked forever?
Usually not. Once the baby tooth is out, the tongue gradually guides the new tooth forward into line. If it does not fully straighten, we will monitor it and address it later if needed.
What ages does this happen?
Most often between five and seven with the lower front teeth, since those are typically the first to change over. It can also happen with upper front teeth, and occasionally around ages nine to twelve as molars and canines come in.
Should I pull the baby tooth myself?
If it is very loose, letting your child work it out naturally is fine. Do not force a firmly attached tooth. If it will not budge, let us look instead.
Is this the same as needing braces?
No. A shark tooth on its own does not mean braces are coming. It can occasionally be an early sign of crowding, which is another reason a checkup around age seven is a smart idea.
Two rows of teeth, one calm next step
If your little one is sporting a shark smile and you would like a professional set of eyes on it, we are happy to help. Book a visit with the Smiles on Yonge pediatric dentist in Richmond Hill, Dr. Leila Raziee, by calling (905) 597-6454 or booking online. We will check that everything is on track, answer every question, and send you home with a plan, even if the plan is happily doing nothing at all.
References
- Canadian Dental Association. Dental Development. https://www.cda-adc.ca/en/oral_health/cfyt/dental_care_children/development.asp
- Nationwide Children’s Hospital, Pediatric Dentistry. Blog Library (includes “shark teeth” guidance for parents). https://www.nationwidechildrens.org/specialties/dentistry/blog-library
- The Journal of the American Dental Association. Tooth Eruption: The Primary Teeth. https://jada.ada.org/article/S0002-8177(14)64257-4/fulltext