Most people develop wisdom teeth between the ages of 17 and 25, with full eruption happening around age 20 on average. You may already have one pushing through without realizing it. The signs range from subtle pressure at the back of your jaw to visible changes in your gums, and some wisdom teeth never break through at all. Here’s how to tell what’s happening in your mouth.
Where to Look and What You’ll See
Wisdom teeth are your third set of molars, positioned at the very back of your mouth. You can have up to four: one in each corner of your upper and lower jaw. To check for them, use a mirror and good lighting. Pull your cheek to the side and look behind your last visible molar. You’re looking for a small white bump poking through the gum tissue, or a raised, reddish area where the gum looks swollen or puffy.
Run your tongue or a clean finger along the gum tissue behind your back molars. If you feel a hard ridge or a sharp edge breaking through, that’s likely a wisdom tooth starting to erupt. Sometimes the tooth only partially emerges, leaving a flap of gum tissue draped over part of it. This flap can trap food and bacteria, which often causes the first noticeable symptoms.
Lower wisdom teeth tend to appear before upper ones. So if you notice something happening on the bottom jaw first, that’s typical.
Early Signs a Wisdom Tooth Is Coming In
The earliest sign is usually a dull pressure or aching sensation at the very back of your jaw. It can feel similar to teething, which makes sense because that’s exactly what’s happening. Your gums in that area may look redder than usual or feel tender when you chew. Some people notice mild swelling along the gum line before any part of the tooth is visible.
Other common early signs include:
- Jaw stiffness or soreness, especially when you wake up or after eating
- Tenderness when brushing the very back of your mouth
- A feeling of crowding, as if your back teeth are being pushed forward
- Gum sensitivity on one side that comes and goes over weeks or months
These symptoms often appear in waves. You might have a sore week, then nothing for a month, then soreness again. Wisdom teeth don’t erupt in one smooth motion. They push through in stages, which is why the discomfort tends to be intermittent.
Pain That Shows Up in Unexpected Places
One of the more confusing things about wisdom teeth is that the pain doesn’t always stay in your mouth. Your third molars sit close to nerves and soft tissues that extend into your ears, jaw, and throat. As these teeth push against surrounding tissue, the discomfort can radiate outward.
It’s common to feel a recurring earache on the same side as an erupting wisdom tooth, or to have what feels like a sore throat that doesn’t come with a cold. Some people experience headaches or pain along the side of their face. If you have unexplained ear or throat pain and you’re in your late teens or twenties, a wisdom tooth could be the source. The nerves serving your jaw, ears, and throat are closely connected, so inflammation around an emerging tooth sends pain signals to neighboring areas.
Signs of an Impacted Wisdom Tooth
Not every wisdom tooth makes it through the gum. When a tooth is blocked by bone, other teeth, or lack of space, it becomes impacted. This is extremely common. An impacted tooth can sit just below the surface (called a soft tissue impaction) or remain fully embedded in the jawbone. You won’t see it by looking in the mirror, but your body will give you clues.
Symptoms of impaction include red or swollen gums behind your last molar, jaw pain, swelling around the jaw, bad breath, and an unpleasant taste in your mouth. Some people find it difficult to open their mouth fully. The key difference between a normally erupting tooth and an impacted one is that impaction symptoms tend to be more persistent and intense, and they don’t resolve on their own over time.
An impacted tooth can also tilt at odd angles, pressing against the neighboring molar. This creates a deep ache that feels like it’s coming from the tooth next door rather than from the wisdom tooth itself.
When a Wisdom Tooth Gets Infected
A partially erupted wisdom tooth is especially vulnerable to infection. That flap of gum tissue covering part of the tooth creates a pocket where food and bacteria collect. The resulting infection, called pericoronitis, is one of the most common reasons people discover they have a wisdom tooth in the first place.
Milder pericoronitis feels like painful, swollen gum tissue near the back of your mouth, and you may find it hard to bite down without hitting the swollen area. You’ll likely notice a bad smell or taste, and sometimes a discharge of pus. More severe cases cause facial swelling on the affected side, swollen lymph nodes under your jaw, and jaw spasms that make it hard to open your mouth.
Certain signs point to an infection that needs urgent attention: a fever over 100.4°F, difficulty swallowing or breathing, swelling that extends down your neck, or rapid facial swelling. A dental infection that spreads to the soft tissues of the neck and throat can restrict your airway and become life-threatening within hours.
How a Dentist Confirms It
The only way to know for certain whether you have wisdom teeth, especially ones that haven’t erupted, is through dental X-rays. A panoramic X-ray captures your entire mouth in a single image, showing all four potential wisdom tooth positions along with your jawbone, nerves, and sinuses. This is the standard tool dentists use to spot unerupted or impacted teeth.
For more complex cases, a cone beam CT scan produces 3D images of your teeth, jaws, and nerves. This is typically reserved for situations where the tooth sits close to a nerve or the dentist needs precise positioning before planning a procedure. A simpler intraoral X-ray can also reveal impacted teeth under the gum line.
If you’re between 17 and 25 and haven’t had a recent dental X-ray, it’s worth getting one. Many people have wisdom teeth forming below the surface long before they feel any symptoms. Your dentist can tell you how many you have, whether they’re positioned to come in normally, and whether they’re likely to cause problems.
Can You Not Have Wisdom Teeth at All?
Yes. Some people are congenitally missing one or more wisdom teeth, meaning they simply never developed. This is a normal variation. Others have wisdom teeth that form but never erupt, staying buried in the jawbone without causing any issues. The only way to distinguish between “no wisdom teeth” and “wisdom teeth hiding below the gum” is an X-ray. If you’ve reached your mid-twenties with no symptoms and no sign of eruption, you may be one of the people who got lucky, but it’s worth confirming with imaging rather than assuming.