Congenitally missing teeth, most often the upper lateral incisors (the teeth either side of the two front teeth), are usually a genetic trait, and a related version of it shows up as peg-shaped lateral incisors that are present but small and cone-like. Neither is unusual, and both can be managed well with the right timing and a team approach between your dentist and an orthodontist. If your child's dentist has mentioned either term at a checkup, here's what it actually means and what the options look like as your child grows.
Key Takeaways
- Upper lateral incisors are the most commonly congenitally missing adult teeth, after wisdom teeth.
- Peg-shaped laterals (small, cone-like teeth) are a milder version of the same genetic trait and often run in families.
- Main options are orthodontic space closure, space opening for a future implant or bridge, or reshaping a peg tooth with bonding or a veneer.
- Implants can't be placed until jaw growth is essentially complete, usually the mid-to-late teens or later.
- A temporary tooth (denture tooth, retainer with a false tooth, or resin-bonded bridge) often bridges the gap until then.
- Early assessment, around ages 7 to 9 when adult teeth are coming in, helps plan which path suits your child's bite.
What Does "Congenitally Missing" Actually Mean?
A congenitally missing tooth is one that never formed in the first place. The tooth bud simply isn't there, so no amount of waiting will bring it through. This is different from a tooth that's missing because it was extracted, knocked out, or is simply taking longer than usual to erupt.
After wisdom teeth, the upper lateral incisors are the teeth most commonly affected. Second premolars (the smaller back teeth in front of the molars) are the next most common. It tends to run in families, so if a parent or sibling was missing the same tooth, or had a small peg-shaped version of it, there's a reasonable chance it will show up again in the next generation.
Dentists usually pick this up on a routine X-ray sometime between ages seven and nine, which is around when the permanent lateral incisors would normally be expected to start coming through.
Peg-Shaped Laterals: The Milder Version
Peg-shaped lateral incisors are thought to be a milder expression of the same genetic trait that causes a lateral incisor to be missing altogether. Instead of not forming at all, the tooth forms, but small and tapered, often described as looking like a little cone or peg rather than the flatter, more rectangular shape of a typical lateral incisor.
Peg laterals aren't a health problem on their own. The tooth usually functions fine. The main issue tends to be appearance, and sometimes the gaps left around a smaller tooth, which can affect how the smile looks and occasionally how the bite comes together.
Planning the Options: Space Closure vs Space Opening
Once your child's growth is far enough along for an orthodontist to properly assess the bite, usually once most adult teeth are in, there are broadly two directions to plan around.
Orthodontic Space Closure
With this approach, braces or clear aligners are used to close the gap by bringing the canine tooth (the pointy tooth next to where the lateral would be) forward into that space. The canine is then typically reshaped with bonding, contouring, or occasionally a veneer, so it mimics the shape of a lateral incisor. This avoids the need for an artificial tooth altogether and can work well when the bite and tooth sizes allow for it.
Space Opening and Maintenance
The alternative is to use orthodontics to open up (or hold open) the correct amount of space for a lateral incisor, with the plan to eventually fill that gap with a dental implant or a resin-bonded bridge. This tends to suit bites where closing the space would cause other problems, such as an awkward fit between the upper and lower back teeth.
Deciding between these two paths depends on the individual bite, the size and position of the other teeth, and your child's facial growth, which is why an orthodontist is usually involved in the planning even if a general dentist manages the day-to-day care.
Why Implants Have to Wait
A dental implant cannot usually be placed until jaw growth is essentially finished, which is typically the mid-to-late teens or later. Placing an implant too early is a problem because the jaw keeps growing and changing shape well into the teenage years, but an implant is fixed rigidly in the bone and doesn't move with that growth. Over time this can leave an implanted tooth looking sunken or out of line with the neighbouring natural teeth, which have kept moving.
Because of this waiting period, most treatment plans include some kind of temporary tooth replacement to use in the meantime. Common options include:
- A single tooth on an acrylic partial denture (a small removable plate), often only worn during the day.
- A retainer with a false tooth built into it, doubling up as both a space maintainer and a cosmetic fix.
- A resin-bonded bridge, a conservative fixed option that attaches a false tooth to the back of the neighbouring teeth using a thin metal or ceramic wing, without heavily cutting down those teeth.
For families who go down the implant route once growth is complete, our articles on how a dental implant is put together and how implants fuse to bone are useful background reading, as is our guide to getting an implant years after a tooth is lost, since the gap is often held for quite some time before the implant stage.
Managing Peg Laterals Without Orthodontics
If a peg-shaped lateral is present but simply small, and the bite and spacing otherwise work fine, orthodontics may not be needed at all. In these cases, a dentist can often rebuild the tooth's shape directly with composite bonding, which reshapes the tooth chairside using a tooth-coloured material, or with a veneer or crown once the tooth and gum are fully mature. This is a much simpler path and is often revisited in the late teens once the gum line and tooth have settled into their final position, since bonding done too early may need refining later. Our article on tooth contouring and reshaping covers how this kind of adjustment works, and readers curious about how a gap between front teeth is handled more generally may also find our piece on gaps between front teeth useful.
| Situation | Typical approach | Timing |
|---|---|---|
| Tooth missing, bite allows closure | Orthodontics to close gap, canine reshaped | Once most adult teeth are in |
| Tooth missing, space kept open | Orthodontics to hold space, temporary tooth, then implant or bridge | Temporary now, implant after growth ends |
| Peg-shaped tooth present, bite unaffected | Bonding, veneer or crown to rebuild shape | Often revisited in late teens |
Why an Early Assessment Helps
Because there are genuinely different paths available, and because some of them (like orthodontic space management) work best if started before all the adult teeth have fully settled, an early look by a dentist, ideally around ages seven to nine, gives everyone more options. It doesn't mean treatment starts immediately. Often the plan is simply to monitor growth with periodic checks and X-rays, and bring in an orthodontist for a formal opinion once there's enough information to work with.
Frequently Asked Questions
Is a congenitally missing tooth hereditary?
It often runs in families, though not every child of an affected parent will have the same trait. If you or a close relative was missing a lateral incisor or had a peg-shaped one, mention this at your child's dental check.
Can peg-shaped teeth be left as they are?
Sometimes, yes. If the shape doesn't bother your child and the bite is unaffected, no treatment is strictly necessary. Many families choose to address it later for cosmetic reasons once the tooth and gum have matured.
Does a missing lateral incisor affect other teeth?
It can. Neighbouring teeth may drift into the space over time if it isn't managed, which is part of why early monitoring matters.
How is a congenitally missing tooth diagnosed?
Usually with a routine dental X-ray taken around the age adult teeth are expected, which shows whether the tooth bud is present under the gum.
Will my child need braces even if just one tooth is affected?
Not always, but orthodontics is commonly involved when a gap needs to be closed or precisely maintained, since fine control of tooth position matters for a good long-term result.
If your child has been flagged with a missing or peg-shaped lateral incisor, an early look now makes the later options simpler and more predictable. The team at Lumi Dental can assess your child's bite and talk through timing with you. Check our current deals or learn more about general dentistry for the whole family at Lumi Dental. This article is general information and does not replace an individual dental assessment.
