My Child Has an Extra Tooth — What Is a Mesiodens?

Usually smaller than a regular tooth. Most are peg-shaped or cone-shaped. Some are barrel-shaped with bumpy cusps. A few look almost like a normal tooth.

What makes it tricky is position — a mesiodens can sit upright, or it can be inverted, meaning the crown points upward toward the nose instead of downward. That detail matters a lot for how and when it gets treated.

Honestly, it's not fully understood. The leading theory is that the tissue responsible for forming teeth becomes a little overactive during development, producing one extra tooth bud. Genetics play a role too — it can run in families.

In most cases it happens on its own, with no underlying condition. In rarer situations it can be associated with syndromes like cleft lip and palate, but that's not the typical picture.

This is the part parents need to pay attention to. A mesiodens that isn't dealt with can cause a surprising amount of disruption:

• The extra tooth physically blocks the permanent front teeth from coming in — which is often how parents first notice something is off
• It can push the front teeth apart, creating a gap in the middle
• It can rotate or push the permanent teeth out of their normal position
• It can damage the roots of the teeth next to it
• If left buried long enough, it can develop a cyst around it — a fluid-filled sac that damages the surrounding bone

No symptoms right now doesn't mean no problem. These complications can develop quietly while your child's smile is still forming.

An X-ray. You won't see a buried mesiodens with a clinical examination alone. A standard dental X-ray is usually enough to detect it. If surgery is being planned, a CBCT scan — a 3D X-ray — may be recommended to pinpoint exactly where the tooth is sitting before any procedure. This is a good reminder that skipping your child's dental X-rays isn't just about cavities.

In most cases, it needs to come out. Here's how that typically unfolds:

• Earlier removal generally means fewer complications and less likelihood of needing orthodontic treatment afterward
• If the mesiodens is inverted, waiting isn't ideal — inverted teeth can drift deeper into the jaw over time, making the procedure more involved
• After extraction, the dentist checks back at six months to see if the blocked front tooth is now coming in on its own
• If it still hasn't come through after six to twelve months, a minor procedure to expose the tooth may be needed, followed by braces to guide it into place
• Adults who find out about a mesiodens late — even without symptoms — are still usually advised to have it removed to prevent future cyst formation

Not automatically. Research shows that many permanently blocked teeth erupt on their own after the mesiodens is removed — particularly when the procedure is done early and there is adequate space."

But if the front teeth have been pushed significantly out of position, or if there's crowding from the delayed eruption, orthodontic treatment is usually part of the picture. An assessment after the extraction will clarify what's needed.