7 Signs Your Wisdom Teeth Need to Be Removed (And When They Don’t)

Wisdom teeth have a talent for timing, often flaring up during exam season or right before a long weekend. But a sore spot at the back of your mouth does not automatically mean surgery, and a wisdom tooth that feels fine is not always trouble-free.

Below, we cover the most common signs wisdom teeth need to be removed, the impacted wisdom teeth symptoms worth paying attention to, and the situations where keeping them is a reasonable choice. Patients in our London, Ontario office ask about all of these regularly, so we have answered them the way we would in the chair.

Key Takeaways

• Recurring pain, swollen gums behind the last molar, a lingering bad taste, decay, and jaw stiffness are among the most common reasons a dentist recommends removal.
• Wisdom teeth that are fully erupted, easy to clean, and part of a stable bite can often stay, with regular monitoring.
• Research has not settled whether healthy, symptom-free impacted wisdom teeth should be removed, so the decision is made case by case.
• Spreading facial swelling, fever, or trouble swallowing or breathing needs emergency medical care right away.

What Are Wisdom Teeth, and Why Do They Cause Problems?

Wisdom teeth are your third molars, the last adult teeth to come in, usually somewhere between the late teens and mid-twenties. Most people have four, one in each back corner of the mouth, although some people have fewer or none at all.

The trouble usually comes down to space. By the time wisdom teeth arrive, the jaw is often already full. When a tooth cannot come in fully or in the right position, it is called impacted (trapped in the gum or jawbone). An impacted wisdom tooth may stay completely hidden in the bone, break partway through the gum, or grow in at an angle, sometimes tipped forward into the molar in front of it.

This is very common. Cleveland Clinic’s wisdom teeth guide notes that most people have at least one impacted wisdom tooth. Impaction on its own is not a sign that something is wrong, though. As Mayo Clinic’s wisdom teeth overview explains, impacted wisdom teeth do not always cause symptoms. What matters is whether the tooth is causing, or is likely to cause, problems for your gums, bone, or neighbouring teeth.

7 Signs Your Wisdom Teeth Need to Be Removed

None of these signs is a diagnosis on its own. Each one is a reason to book an exam so your dentist can see what is actually going on.

1. Pain or Pressure Behind Your Last Molar

A dull ache or pressure at the very back of the jaw is the classic complaint. It may come and go, flare when you chew, or spread toward your ear or the side of your face. Mild tenderness can happen while a tooth is coming in. Pain that keeps returning, or gets worse each time, usually points to something more than normal eruption, such as infection, decay, or pressure on the neighbouring tooth.

2. Red, Swollen Gums Around a Partially Erupted Tooth

When a wisdom tooth only partly breaks through, a small flap of gum often stays draped over part of it. Food and bacteria slip under that flap, where no toothbrush can follow. The result can be pericoronitis (inflammation and infection of the gum tissue around a partially erupted tooth).

It typically shows up as red, puffy, tender gum behind the last molar, and biting down on the flap can make it worse. Pericoronitis often settles with cleaning and care, then comes back a few months later. Repeated episodes are one of the most common reasons we discuss removal with patients.

3. Bad Breath or a Bad Taste That Keeps Coming Back

A sour or unpleasant taste on one side, or bad breath that brushing does not fix, can mean food and bacteria are collecting around a wisdom tooth. Sometimes it means a small amount of pus is draining from an infected area. Mouthwash may mask it for an hour, but it does not fix the cause.

4. Food Trapping and Decay in the Back Teeth

Partially erupted wisdom teeth are hard to clean, which makes them more prone to cavities than most other teeth. The bigger concern is often the second molar, the hardworking tooth right in front. When a wisdom tooth is tipped against it, a food trap forms between the two, and decay can start on the back of the second molar, where it is difficult to see or reach. If food gets stuck in the same back corner every time you eat, mention it at your next visit.

5. Gum Problems Around Your Second Molar

A wisdom tooth that sits against the second molar can make it harder to keep the gum and bone between them healthy. Over time, this area can develop deep pockets, bleeding, or bone loss. A 2020 Cochrane review found very low-certainty evidence that keeping symptom-free impacted wisdom teeth may be linked to a higher long-term risk of gum disease affecting the neighbouring second molar.

If you want a clearer picture of how that process unfolds, our guide to the stages of gum disease walks through it step by step. Gum tissue in this area can also pull back over time, so it helps to know the early signs of receding gums as well.

6. Jaw Stiffness or Trouble Opening Wide

Infection around a lower wisdom tooth can irritate the nearby chewing muscles. You might notice that you cannot open your mouth as wide as usual, that your jaw feels stiff, or that the area under your jaw feels tender or swollen. Limited opening alongside swelling is a sign to call your dentist promptly rather than wait it out.

7. X-Ray Findings You Cannot Feel

Some of the most important reasons to remove a wisdom tooth cause no symptoms at all. Wisdom teeth develop inside a small sac in the jawbone, and in some cases that sac can fill with fluid and form a cyst, which can slowly damage bone, roots, or nerves. Much more rarely, other growths develop. An impacted tooth can also press against the root of the second molar. These findings usually show up on routine X-rays long before anyone feels a thing, which is one reason regular checkups matter even when nothing hurts.