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A wisdom tooth or third molar is the last tooth to erupt, doing so between ages 17 and 25. The eruption process can last from a few months to several years depending on the tooth’s position, available space in the arch, and individual anatomy.
Most patients do not know if their wisdom teeth are coming in correctly or if they are causing problems until pain appears. A panoramic X-ray taken before age 20 allows for anticipation of whether there will be enough space for eruption or if preventive extraction will be necessary, when surgery is simpler and recovery faster.
At Asensio Dental Clinic, Dr. Lucía Asensio Romero (Registration No. 46002287) evaluates the position of wisdom teeth with a 3D scanner and digital orthopantomography. The first visit is completely free.
What are wisdom teeth?
Wisdom teeth are the third molars, the last four teeth of the permanent dentition. They get that name because they emerge in the stage when a person is supposed to have acquired some maturity —between 17 and 25 years old, although they can appear before or after. Not everyone develops all four: some people have agenesis of one or more third molars —that is, they simply do not form— which has no clinical consequence.
The reason wisdom teeth generate so many problems is evolutionary: modern human jaws are smaller than those of our ancestors, but the number of teeth has not changed. The result is that frequently there is not enough space for the third molars to erupt in their correct position, and they remain impacted or semi-impacted in anomalous positions that can damage the adjacent second molar, create periodontal pockets difficult to clean, or produce chronic pain.
Factors that determine how long it takes for a wisdom tooth to come in
The eruption time of a wisdom tooth varies enormously between people. The most influential factors are the available space in the arch —if there is enough space, eruption is faster and cleaner—, the position of the tooth in the bone —vertical, mesioangular, distoangular, or horizontal—, the density of the bone and overlying mucous tissue, and individual genetics.
A wisdom tooth that is erupting correctly in a vertical position with enough space can complete its emergence in 6-12 months. A semi-impacted tooth in a mesioangular position can be “coming in” for years with recurrent episodes of pericoronitis —infection of the tissue that partially covers the crown— without ever completing the eruption.
| Situation | Estimated Time | Recommendation |
|---|---|---|
| Normal eruption with space | 6-12 months | Periodic control |
| Eruption with little space | 1-3 years or indefinite | Assess preventive extraction |
| Impacted or horizontal tooth | Does not erupt | Surgical extraction |
Symptoms of a wisdom tooth coming in
The most frequent symptoms during wisdom tooth eruption are pain or discomfort in the back area of the mouth behind the second molar, swelling of the gum in that area, difficulty opening the mouth completely, bad taste or bad breath due to accumulation of debris under the tissue that partially covers the crown, and pain radiating to the ear or throat in cases of pericoronitis.
If the pain is intense, if there is visible swelling in the face or neck, if you have difficulty opening your mouth or swallowing, or if fever appears, you must consult urgently: these are signs of an infection that can spread quickly. If symptoms are mild and recurrent, consult our guide on post-tooth extraction care to know what to expect if extraction is finally decided.
This information is part of our other dental treatments in Valencia area.
Frequently asked questions about wisdom teeth
Do wisdom teeth always have to be extracted?
No. If the wisdom tooth erupts in the correct position, with enough space, and is accessible for hygiene, it can be kept without problems. Extraction is indicated when the tooth is impacted or horizontal, when it produces recurrent episodes of pericoronitis, when it damages the adjacent second molar, or when the position prevents correct hygiene that is generating cavities or periodontal pockets.
At what age is it best to extract wisdom teeth?
Between 18 and 25 years old, before the roots are fully formed and the bone is denser. At this age, surgery is simpler, the risk of complications is lower, and recovery is faster. Extracting them at 35 or 40 is perfectly possible but technically more complex and with slower recovery.
How long does it take to recover after wisdom tooth extraction?
The first 3-4 days are the most uncomfortable with swelling, discomfort, and limited opening. Most patients resume normal activity within 4-7 days. Complete bone healing takes between 3 and 6 months, although externally the gum heals in 2-3 weeks.