Why Do Humans Have Wisdom Teeth If We Don't Need Them?

Wisdom teeth are often described as ‘useless’, but that is not quite accurate. These are the third and final set of molars at the back of the mouth, usually appearing between the ages of 17 and 25. Some people have no problems with them at all, while others experience pain, swelling, infections, or repeated dental problems.

For a broader perspective, we conducted thorough research and spoke to Dr Lokesh Bahadur Singh, Senior Consultant Dental Surgeon at Kailash Hospital, Dehradun, for an expert perspective.

So, why do we have wisdom teeth if we can live without them?

The short answer to the question is that wisdom teeth are a leftover from an earlier stage of human development. Our ancestors had larger jaws and ate tougher, less processed foods, so an extra set of molars was useful. As human jaws became smaller and diets became easier to chew, wisdom teeth became less necessary. However, the tendency to develop them has remained.

For people today, the more important question is not why they exist, but whether they are likely to cause problems.

Why Do Wisdom Teeth Cause Problems?

The main issue is lack of space.

Most adults have 28 permanent teeth without wisdom teeth. When the third molars try to emerge, there may simply not be enough room at the back of the jaw. As a result, a wisdom tooth may remain partly under the gum or grow at an angle, as per a PubMed study.

This is known as an impacted wisdom tooth.

An impacted tooth does not always cause symptoms. Some remain in the jaw for years without creating trouble. However, their position can make them difficult to clean and may allow food and bacteria to collect around them.

Also Read: Wondered How Humans Cleaned Their Teeth Before Toothpaste?

What Are the Warning Signs?

Wisdom tooth problems can develop gradually or appear suddenly. Common symptoms include pain at the back of the mouth, tender or swollen gums, and discomfort when chewing.

Other signs can include:

• Red or inflamed gums around the tooth
• Bad breath or an unpleasant taste in the mouth
• Difficulty opening the mouth fully
• Pain spreading towards the jaw, ear or nearby teeth
• Repeated gum disease and infections around the wisdom tooth
• Swelling around the jaw or face

According to Dr Surbhi Singh, Consultant Dental Surgeon at Kailash Hospital, Dehradun, "A fever, significant facial swelling, or difficulty swallowing or breathing requires prompt dental or medical attention, as it can indicate a more serious infection."

Why Are Wisdom Teeth Difficult to Clean?

Their position makes them particularly awkward to reach. Even when a wisdom tooth has come through normally, it sits right at the back of the mouth, where brushing and flossing can be difficult.

According to a study published in the International Journal of Surgery Case Reports, if the tooth is only partly erupted, a small flap of gum may cover part of it. Food and bacteria can become trapped underneath this flap, increasing the risk of inflammation and infection. This condition, called pericoronitis, is a common reason for wisdom tooth pain.

Because the area can be difficult to keep clean, decay may also develop in the wisdom tooth or the neighbouring molar.

Does Everyone Need Their Wisdom Teeth Removed?

No. Having wisdom teeth does not automatically mean they need to be extracted.

If a wisdom tooth has erupted properly, is healthy, can be cleaned effectively and is not causing damage or discomfort, a dentist may simply recommend monitoring it.

“I suggest removal when the tooth is repeatedly infected, badly decayed, impacted, damaging a neighbouring tooth or contributing to other dental problems. The decision depends on the position and condition of the tooth, as well as the person's symptoms and overall oral health,” says Dr Singh.

A dentist may recommend an X-ray to understand how the tooth is positioned beneath the gum and whether it could affect surrounding structures.

Also Read: Expert Shares Why You Should Drink Water Before Brushing Your Teeth Every Morning

Can Wisdom Teeth Affect Other Teeth?

They can, particularly when they are impacted or growing at an unusual angle.

A wisdom tooth pressing against a neighbouring molar can make cleaning more difficult and may increase the risk of decay or gum disease around that tooth. In some cases, an impacted tooth can contribute to damage to the nearby tooth.

This is why dentists may monitor wisdom teeth even when they are not currently painful. The absence of pain does not always mean there is no dental problem.

What Should You Do If Your Wisdom Tooth Hurts?

Do not assume that wisdom tooth pain will simply disappear. Mild discomfort can sometimes settle, but recurring pain or swelling should be assessed by a dentist.

Until you can get professional advice, maintaining good oral hygiene is important.

Gently brushing the area can help remove food and plaque, although forcing a toothbrush into a painful or swollen area may make things worse.

Avoid trying to remove or manipulate the tooth yourself. If an infection is present, a dentist can determine whether it needs treatment and whether the wisdom tooth should eventually be removed.

So, Do We Really Need Wisdom Teeth?

For most people, wisdom teeth are not essential. We can eat, speak, and maintain healthy teeth without them. But that does not make every wisdom tooth a problem.

Some people have enough space for their wisdom teeth to grow normally and never experience significant complications. Others have limited space, leading to impaction, infection, or damage to nearby teeth.

The key is not to have wisdom teeth removed simply because they exist, but to understand how they are positioned and whether they are affecting your oral health.

Final Word

Wisdom teeth may no longer be necessary for modern humans, but they are still part of our dental anatomy. If they are healthy and trouble-free, they may be left alone. If they cause persistent pain, swelling, infection, or damage, a dental assessment can help determine the safest next step.