Why Do We Have Wisdom Teeth? Function & Location
Dr. Emrah YEŞİLYURT
Dr. Emrah Yeşilyurt is the Founder of Avangart Clinic. He combines advanced dental expertise with a genuine commitment to helping patients feel comfortable and informed about their oral health journey.
Why Do We Have Wisdom Teeth?
Wisdom teeth are extra back teeth that helped early humans chew hard, rough foods, and they function mainly as extra molars for grinding. Today, most people have smaller jaws, so these teeth often do not have enough room, which can cause crowding, soreness, or other problems.
When you think about your teeth, each group has its own job. The sharper front teeth bite and tear food into small pieces, while the flatter teeth at the back crush and grind it so you can swallow. These back teeth are called molars, and adults have three rows of them on the top and bottom jaws.
The first two rows of molars emerge with your adult teeth during childhood and early teen years. Sometime between the late teens and early twenties, a final row appears at the back of the mouth. They’re called wisdom teeth because they show up when you are older. The main purpose of wisdom teeth was to give early humans the power to chew tough plants and meat.
Over many generations, as our diet changed and our tools improved, we no longer needed those powerful jaws. So human jaws became smaller, and there is often not enough space for these last molars.
When wisdom teeth push against other teeth, cause pain, or lead to infection, your dentist may suggest Tooth Extraction to protect your overall oral health. If they are healthy and easy to clean, your dentist might recommend monitoring them instead of removing them.
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When Wisdom Teeth Usually Develop and Erupt
First come twenty baby teeth, which appear, do their job for a few years, then fall out as thirty-two permanent teeth move in to take their place. The first big back teeth or molars usually show up around age six, and the second set often arrives near age twelve.
Wisdom teeth are the last molars, and they usually try to come in sometime in the late teens or early twenties. In the past, wisdom teeth function was to add extra chewing power, but our jaws have become smaller over time, so these teeth often struggle to find space. Because of this change, scientists think that in the very distant future, humans might not grow wisdom teeth at all.
Right now, many adults still get at least one wisdom tooth, and some research suggests more than half of people over twenty-five have had at least one wisdom tooth. So, do everyone have wisdom teeth? No, some people never form them or form only one or two out of four.
Even if you cannot see any wisdom teeth in your mouth, they might still be hiding under the gums. Sometimes they stay trapped in the jaw and never break through the surface. A simple dental X-ray can show if you have wisdom teeth developing or waiting below the gum line.
Why Did Humans Need Wisdom Teeth?
The wisdom teeth purpose was straightforward for early humans. They needed extra chewing power to eat a tough diet of raw meat, hard nuts, roots, berries, and leafy plants, so an extra set of molars provided them with more grinding surface to break down food well enough to swallow and digest.
Our forefathers also had larger, stronger jaws, so there was plenty of room for these third molars. Wisdom teeth typically come in normally and function similarly to other molars in those larger jaws, without the crowding and pain that many people today experience.
Why Most People No Longer Need Wisdom Teeth Today
As we humans changed our eating habits over time, our bodies changed as well. Our jaws gradually grew smaller while the number of teeth remained the same, resulting in insufficient natural space for each tooth to sit comfortably. At the same time, our diet became much softer as people started to slice, cook, and prepare food in ways that make it easier to chew.
Because of these changes, the possible function of wisdom teeth in modern life is very limited. We no longer rely on them for extra chewing power, and in many people’s mouths, they create more problems than benefits. When wisdom teeth try to squeeze into a small jaw, they can cause pain, crowding, and infection, so dentists often suggest removing problematic wisdom teeth to protect the rest of your teeth and gums.
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Common Issues Linked to Wisdom Teeth
Many people wonder what is the purpose of wisdom teeth, given how many problems they seem to cause. The truth is that some people never have any problems at all, whereas others experience pain, swelling, or infection and require treatment. On top of that, quite a few people are born without some or all of their wisdom teeth, so the experience can vary from person to person.
Impacted wisdom teeth:
A very common issue is impaction, which means a wisdom tooth does not have enough space to come through the gums in a normal way. It can stay fully trapped in the jaw or only partly break through, which often leads to soreness and pressure. Studies suggest that many people who develop wisdom teeth have at least one that becomes impacted.
Pericoronitis and infection:
A flap of gum can hang over a wisdom tooth that is only partly out and trap food and bacteria. This can lead to pericoronitis, a painful infection around the tooth that makes the mouth swell, put a bad taste in your mouth, and makes it hard to open your mouth. If the infection spreads and is not treated, it can become severe and affect the entire body, necessitating immediate medical attention.
Damage to nearby teeth and roots:
Wisdom teeth that have become impacted may push against the second molars in front of them. Over time, this pressure can damage the teeth’s roots or weaken the bone that supports them. In some cases, nearby teeth may become loose, painful, or more likely to decay.
Cysts and other growths:
Around an impacted wisdom tooth, a fluid-filled sac called a cyst can sometimes form. These cysts, along with less common noncancerous tumors, can slowly expand and damage the jawbone or nearby teeth. They often need careful monitoring and sometimes surgery to protect the rest of the mouth.
Pain, crowding, and jaw problems:
Even when there is no major infection, wisdom teeth can create a dull, ongoing ache in the back of the mouth. The pressure of these teeth attempting to fit into a crowded jaw can also influence how the upper and lower teeth meet. In some people, this strain can reach the jaw joints and muscles, causing stiffness, headaches, and clicking in the jaw.
Cavities and gum disease:
Wisdom teeth sit far back in the mouth, which makes brushing and flossing them properly much harder. Because of this, they often develop cavities or inflamed gums, even when the rest of the teeth are healthy. Long-term irritation and trapped bacteria around wisdom teeth can contribute to gum disease that spreads throughout the mouth.
When these issues are present or likely to develop, dentists may recommend wisdom tooth extraction. Even if there is enough space, they may recommend removal to avoid pain, infection, or damage in the future, particularly in younger adults who can easily heal from a wisdom tooth extraction.
When Removal Becomes Necessary (and When It Doesn’t)
Many people are unsure whether their wisdom teeth should be removed, especially if they are not causing pain. You might read about what is the function of wisdom teeth and wonder if keeping them is the better choice. The answer depends on how healthy they are and what your dentist sees during an exam.
For some people, wisdom teeth grow in straight, are fully erupted, and are easy to clean. In that case, they can help with chewing, just like your other molars, and sometimes they support nearby teeth so they stay in a stable position. When they are healthy and checked regularly, there may be no strong reason to remove them.
In a few special cases, healthy fully erupted wisdom teeth can even replace a badly damaged first or second molar. A dentist or specialist can move a healthy wisdom tooth into the empty space to restore chewing function and the appearance of your smile. This option is not suitable for everyone, but it shows that wisdom teeth are not always ineffective.
Wisdom teeth are typically extracted when they cause persistent pain, infection, cysts, or damage to the tooth in front of them. Crowding, persistent swelling, or difficulty cleaning the back of the mouth are all common reasons your dentist may recommend surgery.
There are also situations where removal is delayed or avoided for a time. If you are pregnant, your dentist may prefer to wait until the baby is born unless there is a serious problem. If there is an active infection, your dentist will often treat it first with antibiotics so that surgery is safer and more comfortable.
People who are immunocompromised, or receiving chemotherapy or radiation, need extra care because their healing can be slower and their risk of rare jaw problems can be higher. In all cases, if your wisdom teeth are healthy, properly aligned, and not causing trouble, you may decide to keep them. You can make the best decision with the help of your dentist and the medical professionals who know your full health history.
