Peg Lateral Teeth: Why They’re Small and How to Fix Them

Editorially reviewed by the Dental.me Editorial Team · Updated July 2026

If one or both of the teeth just beside your two front teeth look noticeably smaller, narrower, or almost cone-shaped, you may have what dentists call peg lateral teeth. It is one of the most common little quirks in a smile, and it is almost always harmless. A peg lateral is a cosmetic variation, not a disease, and it is very fixable. This guide explains exactly what peg laterals are, why they form, whether they matter, and the modern treatment options that can turn a small, out-of-proportion tooth into a natural, balanced part of your smile.

What Are Peg Lateral Teeth?

Your upper front teeth come in matched pairs. Right in the center are the two large central incisors. Directly on either side of them sit the lateral incisors. In a typical smile, each lateral incisor has a fairly squared, rectangular shape that mirrors its partner on the other side.

A peg lateral is a lateral incisor that did not develop to full width. Instead of a squared shape, it comes in small and tapered, often narrowing toward the biting edge so it looks cone- or peg-shaped, which is where the name comes from. Dentists classify it as a form of microdontia, meaning a tooth that is smaller than normal.

• Location: the tooth just beside a front tooth, on the upper arch.
• Appearance: narrow, tapered, sometimes rounded or pointed rather than square.
• Pattern: it can affect one lateral incisor or both.

Interestingly, the two sides do not have to match. It is common to have one normally shaped lateral incisor and one peg-shaped one, which is part of what makes the smile look uneven.

Why Peg Laterals Happen

The single most important thing to understand is that peg laterals are developmental. They are set long before a tooth ever erupts, during the way the tooth bud formed. In the large majority of cases the cause is genetic, which is why peg laterals often run in families. If a parent or sibling has small lateral incisors, you are more likely to have them too.

Because it is a formation trait, a peg lateral is not something you caused. It is not the result of poor brushing, an old injury, a childhood habit, or anything you did or did not do. It simply reflects how that particular tooth was mapped out as it developed.

There is also a well-known link between peg laterals and missing lateral incisors. In some people, one lateral incisor comes in peg-shaped while the matching one on the other side never formed at all (a congenitally missing tooth). Both traits sit on the same developmental spectrum, so a dentist who sees a peg lateral will often check whether the opposite tooth is undersized or absent as part of planning your smile.

Are Peg Lateral Teeth a Problem?

For most people, a peg lateral is mainly a cosmetic concern rather than a health one. The tooth itself is usually perfectly healthy. The issue is proportion: because the tooth is narrower than the space around it, it tends to leave gaps on one or both sides, and it can look small next to its neighbors. That combination of gaps plus an undersized tooth is what makes a smile read as uneven.

There can be a few practical wrinkles as well:

• Spacing: the gap beside a peg lateral can trap food and be harder to keep clean.
• Bite and alignment: extra space can let other teeth drift over time.
• Durability: a very small tooth has less surface, so it can be a little more vulnerable to wear or chips.

None of this means a peg lateral is dangerous. Left alone, it usually causes no harm at all. Many people live happily with peg laterals and never treat them. The reason people choose treatment is almost always that they want a more balanced, symmetrical smile, and modern cosmetic dentistry makes that straightforward.

How to Fix Peg Lateral Teeth

The good news is that a small tooth is one of the easier cosmetic situations to correct, because the goal is simply to add width and shape back to a healthy tooth. Here are the main options, roughly from least to most involved.

Dental Bonding

Bonding is often the simplest, most affordable, and least invasive fix. A tooth-colored composite resin is layered onto the small tooth and sculpted to a full, natural shape, then hardened and polished, usually in a single visit with little or no drilling. If you are new to the idea, our overview of what teeth bonding is walks through the whole process, and you can get a sense of budget from our guide to dental bonding cost.

Veneers

Veneers are thin shells (porcelain or composite) bonded to the front of the tooth to rebuild its shape and blend it with the rest of the smile. They tend to be more durable and stain-resistant than bonding and can deliver a very refined result, at a higher cost. If you are weighing materials, compare porcelain versus composite veneers and see roughly how long veneers last before deciding.

A Crown

If a lateral incisor is extremely small or structurally weak, a crown that caps the whole tooth may be recommended for strength as well as appearance. This is less common for a simple peg lateral but is sometimes the right call.

Orthodontics First

This is the step people often overlook. Because a peg lateral usually sits in a space that is the wrong size, braces or clear aligners are frequently used first to position the teeth and open the correct amount of room. Creating the right space lets the dentist build the tooth to natural proportions rather than making it too wide or leaving a leftover gap.

The Typical Treatment Sequence

For many patients, the best result comes from combining two disciplines in the right order. A coordinated cosmetic and orthodontic plan usually looks like this:

• Step 1: Orthodontics. Braces or aligners position the teeth and set the ideal amount of space for a full-width lateral incisor.
• Step 2: Build up the tooth. Once the spacing is right, bonding or veneers reshape the peg lateral to match its neighbor.
• Step 3: A balanced smile. The restored tooth now looks proportional and symmetrical.

When a peg lateral sits alongside a lateral incisor that is completely missing, the plan branches. Options there include an implant or bridge to replace the absent tooth, or orthodontically closing the space and reshaping a neighboring tooth to stand in for the missing one. Our guide to missing teeth replacement options covers those routes in detail. Your dentist and orthodontist will choose based on your bite, your spacing, and how the two sides can be made to match.

On timing: peg laterals are very often addressed in the teen years, right after orthodontic treatment, when the teeth are already being aligned. But there is no deadline. Adults treat peg laterals successfully at any age, and it is never too late to improve the look.

Cost, Durability, and Caring for the Result

Cost and longevity usually move together. Bonding is generally the more budget-friendly starting point, but composite can pick up stain and may need occasional polishing or a touch-up over the years. Veneers cost more up front and require a bit of tooth preparation in most cases, but they tend to last longer and resist staining better. Neither is universally right; the best choice depends on your budget, your goals, and your dentist’s read on the tooth.

Once your peg lateral is restored, caring for it is simple and mostly the same as caring for any tooth:

• Brush twice a day and floss, paying attention to the margins where the restoration meets the tooth.
• Avoid biting hard objects like ice, pens, or fingernails, which can chip bonding or veneers.
• Keep regular checkups so your dentist can polish, refresh, or repair bonding as needed over time.

The Takeaway and When to See a Dentist

Peg lateral teeth are small, tapered side teeth that come from a harmless genetic or developmental variation. They are not caused by anything you did, and by themselves they do not threaten your health. What they do affect is the balance of your smile, leaving gaps and an undersized tooth that can look out of proportion. That is a cosmetic issue, and it is one of the more satisfying ones to fix.

With bonding or veneers, often after a round of orthodontics to create proper spacing, a peg lateral can be rebuilt into a natural, symmetrical tooth that blends right in. If a peg lateral is affecting your confidence, or if it sits next to a gap or a missing tooth, book a consultation. A dentist or orthodontist can look at your spacing and bite, explain your options, and map out the approach that gives you the most natural, balanced result.

Find care near you: compare dentists in your area, or browse dental specialties.