Wisdom teeth most often begin to come through in the late teens or twenties, but there is no exact deadline: published ranges differ, and some teeth never erupt. Canada’s adult-tooth chart lists third molars at 17–21; the Ontario Dental Association describes a broader 15–25 range, while Mayo Clinic gives 17–26. A little pressure or tenderness behind the last molar can happen, but symptoms alone cannot confirm that a wisdom tooth is moving. Worsening pain, a swollen gum flap, bad taste, or trouble opening your mouth deserves a dental assessment; fever, spreading face or neck swelling, or difficulty swallowing needs urgent attention. Breathing difficulty is an emergency. A wisdom tooth does not need removal simply because it is erupting: a dentist can assess its position, symptoms and effects on nearby teeth, sometimes using X-rays, then discuss monitoring or treatment.
When do wisdom teeth come in?
Wisdom teeth are the third molars at the very back of the mouth. They are the last permanent teeth to develop and may emerge at different times on different sides. Some break through fully, some appear only in part, and some remain beneath the gums. A person may also have fewer than four wisdom teeth or none.
Age ranges are estimates, not a test of whether something is wrong. Canada.ca lists third molars at 17–21 in its permanent-tooth chart. The Ontario Dental Association gives 15–25 as a usual range, and Mayo Clinic says 17–26. These sources use slightly different ranges, but all point to late adolescence through young adulthood as a common period. A tooth may appear later, remain impacted, or never form; timing by itself does not determine whether treatment is needed.
A dentist may discuss wisdom-tooth screening in adolescence as part of routine care. Whether an exam or X-ray is useful depends on your history, symptoms and what the clinician needs to assess. An image can help show a tooth’s position when it is not visible or appears tilted, but a symptom list or online age chart cannot show whether your tooth is impacted.
Common signs a wisdom tooth may be coming through
Possible signs include a visible corner of a tooth behind the second molar, mild gum tenderness or puffiness at the very back of the mouth, and a temporary dull pressure in the jaw. A tooth that is only partly through may leave a gum flap where food and plaque collect; the area may feel sore or taste unpleasant. These signs are not specific to eruption. A cavity, gum problem or another dental issue can cause similar discomfort, so persistent or recurring symptoms should be checked.
How urgent are wisdom-tooth symptoms?
Use this guide to choose a next step, not to diagnose yourself. If you are unsure or symptoms are worsening, contact a dentist.
Partial eruption, impaction and pericoronitis
A wisdom tooth is partially erupted when some of its crown has come through the gum but part remains covered. A flap of gum can make cleaning difficult and trap food. This can contribute to pericoronitis, inflammation around the crown of a partly erupted tooth. Local tenderness, swelling or an unpleasant taste can occur, but a dentist needs to examine the area to identify the cause.
An impacted tooth is blocked from erupting normally or remains trapped under gum or bone. It may point toward the second molar, lie at an angle, or remain below the surface. Some impacted teeth cause no symptoms; others can be associated with inflammation, decay, damage to the neighboring molar or other problems. A dental exam and, when appropriate, imaging help evaluate position and nearby structures.
For a partly erupted area, gentle cleaning with a small soft toothbrush can help remove food. Avoid poking under the gum with sharp objects or trying to drain swelling. If cleaning is too painful, the area is repeatedly inflamed, or symptoms worsen, arrange an assessment rather than relying on home care alone.
When should you see a dentist?
Contact a dental office if discomfort persists or returns, the gum repeatedly swells, food keeps collecting behind the last molar, you notice a bad taste, or it becomes difficult to open your mouth. A clinician can check for eruption, impaction, infection, decay and problems affecting the second molar. Seek urgent care for face or neck swelling, fever or feeling unwell with worsening dental symptoms, restricted mouth opening, or difficulty swallowing. Difficulty breathing or rapidly worsening swallowing requires emergency care.
If a wisdom tooth is visible and comfortable, keep regular check-ups so your dentist can monitor whether it is healthy and cleanable. If you have recurring tooth pain more broadly, see our separate guide to understanding wisdom-teeth pain.
What can help with mild discomfort?
- Keep brushing gently around the back molars with a soft toothbrush. If a gum flap is present, use care to keep the area clean without forcing an object beneath the gum.
- Choose softer foods temporarily if chewing irritates the area, and avoid repeatedly pressing or testing the tooth with your tongue or fingers.
- If you normally can take an over-the-counter pain reliever, follow its package directions. Ask a dentist or pharmacist first if you are pregnant, under 18, have a health condition, take other medicines, or are unsure which option is safe for you.
- Do not use leftover antibiotics. A dentist should assess possible infection and decide whether medication or dental treatment is needed.
Pain relief may reduce discomfort but does not identify the cause. Do not use it to postpone an appointment if symptoms are worsening, recurring or accompanied by swelling, fever, a bad taste or difficulty opening your mouth.
Does a wisdom tooth need to be removed?
No. Eruption alone does not mean a wisdom tooth needs to come out. The Ontario Dental Association says removal decisions depend on current symptoms and the likelihood of future problems, with the dentist considering gum health, available space, growth direction, nearby teeth and cavity risk. The NHS says a wisdom tooth that is not causing problems is usually left in place and monitored at routine check-ups.
Removal may be discussed when a tooth is repeatedly infected, cannot be kept clean, has decay that cannot be managed, damages a neighboring tooth, or has another diagnosed problem. The clinician should explain the reason, likely benefits, alternatives and surgical risks for your case. Monitoring can also be appropriate; the decision is individual. If removal is recommended, ask whether an oral surgeon should assess it and what the X-ray shows.
Frequently asked questions
What age do wisdom teeth usually come in?
Late teens and the twenties are common. Published ranges vary: Canada’s chart lists 17–21, the ODA says 15–25 and Mayo Clinic says 17–26. Some teeth erupt later, stay impacted or never form, so there is no universal deadline.
How can I tell if my wisdom teeth are coming in?
You may notice a visible tooth behind the last molar, mild gum tenderness or pressure. A dentist can confirm what is happening; similar symptoms can come from decay or gum inflammation.
Is wisdom-tooth pain normal?
Mild, brief tenderness can occur, but pain is not proof of normal eruption. Persistent, recurrent or worsening pain—especially with swelling, bad taste, fever or difficulty opening your mouth—should be assessed by a dentist.
Should all wisdom teeth be removed?
No. Removal is not automatic. A dentist evaluates symptoms, position, cleanability and risks to nearby teeth; problem-free teeth may be monitored.
When is wisdom-tooth swelling an emergency?
Contact a dentist promptly for worsening pain or swelling. Facial or neck swelling, fever or feeling very unwell, restricted mouth opening, or trouble swallowing needs urgent medical or dental assessment. Trouble breathing or rapidly worsening swallowing is an emergency.
Sources and further reading
- Government of Canada, Oral health for children: permanent-tooth eruption chart.
- Ontario Dental Association, Wisdom Teeth Removal.
- Mayo Clinic, Impacted wisdom teeth: Symptoms and causes.
- NHS, Wisdom tooth removal; NHS England, Pericoronitis around an erupting wisdom tooth.
- American Dental Association MouthHealthy, Wisdom Teeth.