Impacted teeth: what it means, and when treatment is needed.
A tooth is "impacted" when it can't emerge into its normal position — usually because there isn't room or it's growing at an angle. Wisdom teeth are by far the most common, but canines can be affected too. Not every impacted tooth causes trouble, so the right approach ranges from simply monitoring to removal. Here's how to tell the difference.
What an impacted tooth is
An impacted tooth is one that is blocked from erupting fully into its proper place — it stays partly or completely below the gum or bone. It happens when there isn't enough room in the jaw or the tooth is angled wrongly. Wisdom teeth (the last molars) are the usual culprits because they come through last, when space has run out; upper canines are the next most common. An impacted tooth may cause no problems at all, or it may lead to pain and infection.
Why teeth become impacted
The basic cause is a mismatch between tooth and jaw size — not enough room for the tooth to come through. The tooth may then grow at an angle, pressing into the neighbour, or stay horizontal or trapped in bone. It's largely down to genetics and jaw development. Crowding from other teeth, or a baby tooth that didn't fall out, can also block an adult tooth's path.
The signs to watch for
Many impacted teeth are silent and found only on an X-ray. When they do cause symptoms, look for pain or tenderness at the back of the jaw, red, swollen or sore gum over the tooth (a partly-erupted wisdom tooth easily traps food and bacteria — "pericoronitis"), bad breath or a bad taste, difficulty opening the jaw, and occasionally damage or crowding of the neighbouring teeth. Recurring infection or pain is the usual reason treatment is recommended.
When and how it's treated
An impacted tooth that causes no problems is often just monitored — removal isn't automatic. Treatment is recommended when it causes repeated infection, pain, decay or damage to the neighbouring tooth. The usual treatment for a problematic wisdom tooth is removal (a surgical extraction if it's below the gum). An impacted canine, by contrast, is often valuable enough to expose and guide into place with orthodontics rather than remove. The decision is made from an X-ray and your symptoms.
Frequently asked questions
What does an impacted tooth mean?
It means a tooth can't emerge into its normal position — it's blocked, partly or fully, below the gum or bone, usually for lack of room or because it's growing at an angle. Wisdom teeth are most commonly affected, followed by upper canines. Some cause no problems; others lead to pain and infection.
Do impacted teeth always need to be removed?
No. An impacted tooth causing no problems is often simply monitored. Removal is recommended when it causes repeated infection, pain, decay, or damage to the neighbouring tooth. An impacted canine is frequently exposed and guided into place with orthodontics rather than removed. It's decided case by case.
What are the signs of an impacted wisdom tooth?
Pain or tenderness at the back of the jaw, red and swollen gum over the tooth, bad breath or a bad taste, difficulty opening the jaw, and sometimes pressure on the neighbouring tooth. A partly-erupted wisdom tooth easily traps bacteria and gets infected (pericoronitis). Many, though, cause no symptoms.
Is removing an impacted tooth painful?
The removal is done under local anaesthetic (sometimes with sewing), so it isn't painful at the time; some swelling and soreness for a few days afterward is normal and managed with pain relief and after-care. Following the after-care lowers the risk of complications like dry socket.
Not a substitute for professional advice. This article is general patient information, not a diagnosis or treatment plan. Always consult a qualified dentist about your own situation.
References & sources
Illustrations © Tantalya Dental Clinic — original diagrams created for this article. Educational content references public-domain health information from the U.S. National Library of Medicine (MedlinePlus). Not affiliated with or endorsed by any third party.
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