Microdontia means one or more teeth are noticeably smaller than average, and a single small tooth is far more common than every tooth being small. Overall it is estimated to affect around one and a half to two percent of people, and it is slightly more common in women. Most cases are cosmetic rather than a health problem, and where the appearance bothers someone, the shape can usually be built up with bonding, veneers or a crown.
Key takeaways
- Microdontia is a tooth, or teeth, smaller than the usual size.
- The most common form is a single small tooth, often the upper lateral incisor, known as a peg lateral.
- All teeth being small is rare and usually linked to a broader condition.
- Treatment is optional and cosmetic in most cases, using bonding, veneers or crowns to rebuild size and shape.
The three types of microdontia
Dentists group microdontia into three patterns. Localised microdontia is a single small tooth, the most common form by far, and the upper lateral incisor next to the two front teeth is the classic example. Relative generalised microdontia is where the teeth are actually normal in size but look small because the jaws are large, so the impression of smallness is a matter of proportion. True generalised microdontia, where every tooth is genuinely smaller than normal, is the rarest form and is usually associated with a wider condition rather than occurring on its own.
What causes small teeth
A single small tooth usually reflects a local variation in how that tooth developed, and often runs in families. Generalised small teeth are more likely to be linked to a systemic influence during early development, such as some genetic syndromes, or, less commonly, radiation or chemotherapy affecting tooth formation in young childhood. Microdontia frequently travels with other developmental differences, such as missing teeth, which is why a dentist may check the whole dentition when a small tooth is noticed. Our guides on missing teeth and ectodermal dysplasia explain some of those links.
Treatment options
Treatment is usually about appearance and is entirely optional. The table below compares the common approaches for building up a small tooth.
| Option | What it involves | Good to know |
|---|---|---|
| Composite bonding | Tooth-coloured resin sculpted onto the tooth in one visit | Most conservative, little or no tooth removal, easy to repair |
| Porcelain veneers | Thin custom shells bonded to the front of the tooth | Durable and stain-resistant, needs some enamel preparation |
| Crown | A cap covering the whole tooth | Used when a tooth also needs structural support |
| Orthodontics first | Aligning and spacing teeth before reshaping | Often combined so the final result looks balanced |
Building up a small tooth
Where a small tooth sits in the smile line, such as a peg-shaped lateral incisor, many people choose to have it reshaped for a more even look. The most conservative route is composite bonding, which adds tooth-coloured resin to rebuild the shape in a single visit without removing healthy tooth structure. Veneers offer a longer-lasting, stain-resistant result but involve a little enamel preparation. Sometimes orthodontics is done first to create the right amount of space, then the tooth is built up to match its neighbours. Our detailed guide on peg lateral incisors covers this specific situation, and you can read more about composite bonding on our service page.
Frequently asked questions
Is microdontia a health problem?
Usually not. A small tooth is generally healthy and functional. The main reason people seek treatment is appearance, which is optional.
Which tooth is most often small?
The upper lateral incisor, the tooth beside each front tooth. A small, cone-shaped version of it is called a peg lateral.
Can small teeth be made larger?
Yes. Composite bonding, veneers or crowns can rebuild a small tooth to match its neighbours. Bonding is the most conservative option.
Is microdontia inherited?
A single small tooth often runs in families. Generalised small teeth can be linked to genetic conditions, so a dentist may assess the whole mouth.
Does a child with a small baby tooth need treatment?
Not usually. Many small teeth need only monitoring. Any cosmetic work is generally left until the adult teeth and jaws have matured.
If a small or unevenly shaped tooth bothers you, the team at Lumi Dental in Melrose Park can talk through your options. Book a complimentary cosmetic consultation through our free cosmetic consult page, or see our current deals. We do not publish prices in our articles and are happy to provide a written estimate after an examination.
This article is general information only and is not a substitute for personalised dental advice. Please see a dentist about your own situation.
