Can a Wisdom Tooth Grow Sideways & Push Other Teeth?

Introduction

Many patients notice unexpected changes at the back of their mouth in their late teens or twenties — a dull ache, pressure, or tenderness near the jaw — and begin to wonder whether a wisdom tooth might be responsible. It is a common concern, and one that leads many people to search online for answers before deciding whether to see a dentist.

Wisdom teeth, also known as third molars, are the final set of adult teeth to emerge. Because they arrive when the jaw is already fully developed, there is often limited space available for them to erupt correctly. A sideways wisdom tooth, clinically referred to as a horizontally or mesially impacted wisdom tooth, is a situation where the tooth grows at an angle rather than straight upward, sometimes pressing against the roots of the neighbouring molar.

This article explains what happens when a wisdom tooth grows sideways, whether it can genuinely push against and affect your other teeth, the symptoms to be aware of, and when seeking a professional dental assessment may be appropriate.

Featured Snippet Answer

Can a wisdom tooth grow in sideways and push against your other straight teeth?

Yes, a sideways wisdom tooth — known as an impacted third molar — can grow at an angle and press against the roots of adjacent teeth. This is called horizontal or mesial impaction. Whilst it does not always cause immediate pain, it may contribute to crowding, root pressure, and localised discomfort over time. A clinical assessment is needed to evaluate the extent of any impact.

What Is a Sideways Wisdom Tooth?

A sideways wisdom tooth is a third molar that, rather than erupting vertically through the gum in a normal upright position, grows at an angle — sometimes almost completely horizontal. Dentists classify wisdom tooth impactions by the direction of growth:

Mesial impaction – The tooth tilts forward at an angle towards the front of the mouth, pressing against the second molar. This is the most common type.
Horizontal impaction – The tooth lies almost completely on its side beneath the gum.
Distal impaction – The tooth tilts backward towards the rear of the jaw.
Vertical impaction – The tooth grows in the correct direction but cannot fully erupt due to insufficient space.

Horizontal and mesial impactions are particularly relevant when considering whether a wisdom tooth might push against neighbouring teeth. Because the tooth is angled directly towards the adjacent second molar, the pressure it generates can be directed at the root or crown of that tooth.

The exact position and angle of an impacted wisdom tooth can only be accurately determined through a clinical dental examination, typically supported by dental X-rays.

Why Do Wisdom Teeth Sometimes Grow Sideways?

Understanding why wisdom teeth grow sideways involves looking at both dental development and jaw anatomy. Most people develop four wisdom teeth — one in each corner of the mouth — but the human jaw has evolved over millennia to become smaller. As a result, there is frequently insufficient space at the back of the mouth for these teeth to emerge in a fully upright position.

Several factors can influence whether a wisdom tooth grows at an angle:

Limited jaw space – If there is not enough room for the tooth to erupt normally, it may deflect into adjacent structures.
Position of neighbouring teeth – A firmly established second molar can act as a physical barrier, causing the emerging wisdom tooth to angle against it.
Genetics – Jaw size and tooth size are largely inherited, meaning family history can play a role in whether impaction is likely.
Tooth angulation during development – Some wisdom teeth develop at an angle from early on, making sideways eruption more probable regardless of available space.

It is worth noting that not all wisdom teeth cause problems. Some remain fully beneath the gum (fully impacted), some partially emerge, and others erupt completely without difficulty. Each case is individual and should be evaluated on its own clinical merits.

The Dental Science: How a Sideways Wisdom Tooth Can Affect Adjacent Teeth

The concern that a sideways wisdom tooth might push against and damage straight teeth is clinically recognised and supported by dental research. When a mesially or horizontally impacted wisdom tooth grows, it exerts pressure along the path of least resistance — often directly into the root structure of the second molar.

Over time, this sustained pressure may lead to a condition called external root resorption, whereby the root of the adjacent tooth is gradually eroded by contact with the impacted tooth. This is a significant dental concern because root resorption weakens the structural foundation of an otherwise healthy tooth and can affect its long-term prognosis.

In addition to root resorption, the sideways wisdom tooth may:

Create a pocket between the teeth – The partially erupted crown of a tilted wisdom tooth can be difficult to clean effectively, creating a space where bacteria accumulate.
Increase the risk of dental caries – Both the wisdom tooth and the back surface of the adjacent second molar are vulnerable to decay in this situation.
Cause localised inflammation – A condition called pericoronitis — inflammation of the gum tissue surrounding a partially erupted tooth — can develop when bacteria become trapped beneath the overlying gum flap.

Whether or not tooth movement or crowding of the front teeth is caused by wisdom tooth pressure remains an area of ongoing discussion in the dental literature. Whilst some patients worry that impacted wisdom teeth are responsible for their teeth becoming crooked, the current evidence suggests this relationship is not straightforward. Any concerns about changes in tooth alignment should be discussed with a dental professional.

Signs and Symptoms That May Indicate an Impacted Wisdom Tooth

Not everyone with a sideways wisdom tooth experiences noticeable symptoms, particularly if the tooth remains fully beneath the gum. However, there are several signs that may suggest a wisdom tooth is growing at an angle and potentially affecting surrounding structures.

Common symptoms associated with impacted or sideways wisdom teeth include:

Pain or aching at the back of the mouth – This may be felt near the jaw, ear, or throat in some cases.
Swelling or tenderness in the gum behind the last molar – Often localised but may spread if infection is present.
Difficulty fully opening the mouth (trismus) – Jaw stiffness or restricted opening can sometimes accompany inflammation.
An unpleasant taste or bad breath – This may indicate bacteria are accumulating around a partially erupted tooth.
Pressure or sensitivity in the area – A feeling of pressure at the back of the jaw, even without acute pain.
Visible partially emerged tooth – Sometimes a small portion of the wisdom tooth crown may be visible through the gum.

It is important to note that these symptoms are not exclusive to wisdom teeth and may be associated with other dental conditions. If you experience any of the above, it is advisable to have a professional dental assessment to determine the cause.

When Professional Dental Assessment May Be Appropriate

If you are experiencing any discomfort, pressure, or swelling at the back of your mouth, or if you have noticed changes around your back teeth, it may be worth arranging a dental assessment. Early evaluation allows a dentist to monitor the position and development of wisdom teeth and make informed decisions about management.

Situations where a professional dental assessment is particularly worth considering include:

Persistent or recurring pain near the back of the jaw that does not resolve on its own
Swelling in the gum or cheek around the back of the mouth
Signs of infection such as discharge, persistent bad taste, or fever alongside dental pain
Difficulty chewing or opening the mouth that is not related to a known cause
Concerns about neighbouring teeth — for example, if you notice sensitivity in your second molar

A dentist will typically take dental X-rays to assess the exact position and angulation of any impacted wisdom tooth, evaluate the health of adjacent teeth, and discuss the most appropriate course of action. Depending on findings, this may range from a period of monitoring to referral for wisdom tooth removal if clinically indicated.

Treatment suitability and recommendations will always depend on individual clinical findings and should never be assumed without examination.

Treatment Considerations for Sideways Wisdom Teeth

There is no single universal approach to managing a sideways wisdom tooth. The appropriate course of action depends entirely on the individual patient's clinical presentation, the degree of impaction, symptoms experienced, and the effect on neighbouring teeth. Management options that a dentist may discuss include:

Monitoring and observation – If a sideways wisdom tooth is not causing symptoms and shows no evidence of damage to adjacent teeth or the surrounding bone, a dentist may recommend regular monitoring with periodic X-rays. Not all impacted wisdom teeth require immediate intervention.

Oral hygiene guidance – For partially erupted wisdom teeth, maintaining thorough oral hygiene around the affected area is important. A dentist or hygienist may provide specific advice on cleaning techniques and suitable interdental aids.

Management of pericoronitis – If gum inflammation has developed around a partially erupted wisdom tooth, a dentist may recommend professional cleaning of the area, antibiotics where appropriate, or, in recurring cases, discuss further options.

Extraction – Where a sideways wisdom tooth is causing recurrent infection, damage to adjacent teeth, or ongoing symptoms that affect quality of life, extraction may be recommended. This is typically carried out by a dentist or an oral surgeon, depending on the complexity of the case. Dental X-rays and examinations are an important part of assessing whether extraction is necessary.

The decision to extract a wisdom tooth is always based on a thorough clinical assessment and takes into account the patient's overall dental health, medical history, and individual circumstances.

Prevention and Oral Health Advice

Whilst it is not possible to prevent wisdom teeth from growing at an angle — as their direction of eruption is largely determined by jaw anatomy and genetics — there are practical steps you can take to support your oral health and potentially reduce the risk of complications.

Regular dental check-ups – Attending routine dental appointments allows your dentist to monitor the development and position of wisdom teeth over time. Early identification of impaction means that action can be taken before complications arise, rather than waiting until symptoms develop.

Dental X-rays as recommended – Periodic X-rays during check-ups provide valuable information about the position of wisdom teeth beneath the gum, even before any symptoms are present.

Good oral hygiene at the back of the mouth – The area around wisdom teeth can be challenging to clean thoroughly. Using a small-headed toothbrush and, where appropriate, interdental brushes or a water flosser can help reduce the build-up of bacteria in hard-to-reach areas.

Report changes promptly – If you notice new pain, swelling, or changes at the back of your mouth between appointments, contact your dental practice rather than waiting until your next routine visit.

Maintain a balanced diet – A diet low in sugar helps to reduce the risk of decay around partially erupted wisdom teeth, which are particularly susceptible due to their position and the difficulty of cleaning them effectively. You can find general dietary guidance on supporting good oral health on the St Paul's MD website.

Key Points to Remember

A wisdom tooth can grow sideways (an impacted third molar) and may press against the roots of the adjacent second molar.
This type of impaction is classified by its angle — most commonly mesial (tilting forward) or horizontal (almost completely sideways).
Not all sideways wisdom teeth cause symptoms or require intervention; each case is clinically individual.
Potential complications include root resorption of neighbouring teeth, gum inflammation (pericoronitis), and increased risk of dental decay.
The relationship between wisdom teeth and crowding of the front teeth is not conclusively established and should be discussed with a dental professional.
Regular dental check-ups and X-rays are the most effective way to monitor wisdom tooth development and catch any concerns early.

Frequently Asked Questions

Can a wisdom tooth really push other teeth out of alignment?

The evidence on whether wisdom teeth directly cause front tooth crowding is not definitive. However, a sideways wisdom tooth can press against the adjacent second molar's root. Whether this affects wider tooth alignment depends on individual anatomy and should be assessed by a dentist.

How do I know if my wisdom tooth is growing sideways?

You may not always notice obvious symptoms. Common signs include aching or pressure at the back of the jaw, gum tenderness, swelling, or difficulty opening the mouth fully. A dental X-ray is needed to confirm the direction and position of the tooth accurately.

Is it always necessary to remove a sideways wisdom tooth?

Not always. If the tooth is fully impacted and causing no symptoms or damage to surrounding structures, monitoring may be appropriate. Extraction is generally considered when there are recurring infections, damage to adjacent teeth, or persistent symptoms affecting daily life.

What is pericoronitis and is it related to wisdom teeth?

Pericoronitis is inflammation of the gum tissue around a partially erupted tooth, most commonly a wisdom tooth. It occurs when bacteria become trapped beneath a flap of gum tissue overlying the tooth. Symptoms may include pain, swelling, and occasionally difficulty swallowing or opening the mouth.

At what age do wisdom teeth typically appear?

Wisdom teeth generally emerge between the ages of 17 and 25, though the timing varies between individuals. Some people's wisdom teeth never fully erupt, whilst others may not develop them at all. Development can sometimes continue into the early thirties.

Will removing a sideways wisdom tooth protect my other teeth?

In cases where a sideways wisdom tooth is causing or at risk of causing root resorption or recurring infection in adjacent teeth, extraction may help protect those teeth from further damage. However, the specific benefits depend on each patient's individual clinical circumstances.

Conclusion

A sideways wisdom tooth — or impacted third molar — is a genuine dental concern that can, in certain circumstances, press against the roots of adjacent straight teeth and contribute to complications including root resorption, localised infection, and decay. Understanding why wisdom teeth grow sideways, what symptoms to be aware of, and when to seek professional advice can help patients make informed decisions about their dental health.

The good news is that not every sideways wisdom tooth requires immediate treatment. Many cases are managed conservatively through monitoring, good oral hygiene, and regular check-ups. Where intervention is needed, treatment options are available and can be discussed clearly with a dental professional.

If you are experiencing discomfort, pressure, or swelling at the back of your mouth, or if you have questions about your wisdom teeth, arranging a dental assessment is a sensible first step.

Dental symptoms and treatment options should always be assessed individually during a clinical examination.

Disclaimer

This article is for educational purposes only and is not a substitute for professional dental advice, diagnosis, or treatment. Individual conditions vary — please consult a qualified dental professional for personalised guidance. In a dental emergency, seek immediate professional care.