Turner's tooth, also called Turner's hypoplasia, is an enamel defect in a single adult tooth that develops because of a problem in the baby tooth that sat above it. When a baby tooth has a long-standing infection or takes a knock, it can disturb the enamel of the adult tooth forming underneath. The adult tooth then comes through with a patch of discoloured, pitted, or thin enamel. It usually affects just one tooth, which is the clue that sets it apart from defects that affect many teeth at once.
Key takeaways
- Turner's tooth is an enamel defect in one adult tooth, caused by trouble in the baby tooth before it.
- The two main causes are a long-standing infection in a decayed baby tooth, or an injury to a baby tooth pushed into the developing adult tooth.
- It usually affects a single tooth, often a premolar (from decay) or an upper front tooth (from injury).
- The tooth may look discoloured or pitted and can be more sensitive.
- Treatment depends on severity, from sealing and bonding to a crown, plus extra decay prevention.
The one clue that points to Turner's tooth: just one tooth is affected
Many enamel problems affect several teeth, because whatever disturbed them happened while a whole group was forming. Turner's tooth is different. Because it comes from a single baby tooth above it, it almost always shows up on one adult tooth, with healthy teeth on either side. That single-tooth pattern, plus a history of a decayed or injured baby tooth in the same spot, is what makes a dentist suspect it.
What causes it
Infection in a baby tooth
If a baby tooth decays deeply and develops an infection at its root, that pocket of infection sits right next to the adult tooth forming below. The inflammation can disturb the cells laying down enamel, leaving a defect. This is the more common cause and tends to affect premolars, the adult teeth that replace the back baby teeth.
Injury to a baby tooth
A knock that pushes a baby tooth up into the gum can press on the adult tooth bud underneath. This is why Turner's tooth in the upper front teeth usually traces back to an earlier injury, often around the toddler years when falls are common. The developing enamel is dented or discoloured at the point of contact.
What it looks like
A Turner's tooth can range from a small white or yellow-brown patch to a clearly pitted, rough, or partly missing area of enamel. The amount of defect reflects how much enamel had already formed when the disturbance happened. Some teeth are only marked cosmetically, while others have weaker enamel that chips or decays more easily and can feel sensitive to hot, cold, or sweet things. Unlike active decay, the marks are usually present from the moment the tooth erupts.
How it is treated
Treatment depends on how affected the tooth is and whether it bothers your child. Options range from doing very little to rebuilding the tooth.
| Severity | Common approach |
|---|---|
| Mild colour change only | Monitor, strengthen enamel, sometimes microabrasion or whitening later |
| Small pits or sensitivity | Fluoride, sealants, tooth-coloured bonding |
| Larger defect or weak enamel | Bonding or a crown to protect and restore the tooth |
| Severely affected tooth | Crown, or occasionally removal and orthodontic or prosthetic planning |
Because the enamel is weaker, extra prevention matters: thorough brushing with fluoride toothpaste, limiting sugary snacks and drinks, and regular dental visits so any decay is caught early. For tooth-coloured marks that are mostly cosmetic, our overview of tooth shape and enamel variations in children gives a sense of how dentists weigh up watching versus treating.
Can it be prevented?
The best prevention is looking after baby teeth. Treating decay in baby teeth early, before it reaches the root and forms an infection, lowers the chance of a Turner's tooth forming below. After a knock to a baby tooth, a dental check helps catch problems and keep an eye on the adult tooth as it develops. Our guides on a knocked-out baby tooth and nerve treatment for a baby tooth explain how baby-tooth problems are managed to protect the adult tooth underneath.
Frequently asked questions
Is Turner's tooth harmful?
Often it is mainly cosmetic, but a more affected tooth can be sensitive and decay more easily. With good prevention and any needed restoration, these teeth usually do well.
Will the discolouration get worse?
The defect itself is set when the tooth forms and does not spread, though a weak area can chip or decay if not protected. New staining usually means something else, such as surface stain or decay, which a dentist can sort out.
Can the tooth be whitened?
Sometimes mild discolouration improves with microabrasion or whitening, while pitted enamel is usually better restored with bonding or a crown. A dentist will advise what suits the specific tooth.
Does my other child need checking?
Turner's tooth is not inherited, so it does not run in families. It simply reflects what happened to one particular baby tooth, so siblings are not at higher risk for that reason.
Talk to the team at Lumi Dental
If one of your child's adult teeth has come through marked or pitted, the team at Lumi Dental can check it and recommend the gentlest effective option. Lumi Dental does not list its own prices here. See our current deals, ask for a written quote, or book with a general dentist in Melrose Park. The Child Dental Benefits Schedule may help with costs for eligible children.
This article is general information only and is not a substitute for personal dental advice. Please see a dentist about your child's situation.
