Misaligned Teeth: Causes and Prevention

Misaligned teeth are among the most common reasons for orthodontic treatment — in children as well as adults. Crooked teeth, crowding, or gaps are not just a matter of appearance: over time, they can also impair the function of the jaw and bite.

In this article, you’ll learn how misaligned teeth develop, what factors play a role, and what you can do to prevent them early on.

What Is a Misaligned Tooth?

A misaligned tooth is a deviation of the teeth or jaw from their ideal position. This means: the teeth are not optimally positioned in the jaw or do not properly engage when you bite down.

Misaligned teeth can be both inherited and acquired over time.

What Types of Misaligned Teeth and Jaw Malocclusions Exist?

Specialists distinguish between misaligned individual teeth and malocclusions of the jaws in relation to each other. The most common forms:

• Crowding: The teeth lack space, stand rotated or overlapping – the most common misalignment overall.
• Gaps (Diastema): too much space, often between the upper front teeth.
• Overjet / Class II malocclusion (Distoclusion): The upper front teeth protrude far beyond the lower ones; the lower jaw sits back.
• Underbite (Class III malocclusion): The lower jaw protrudes beyond the upper jaw.
• Deep bite and closed bite: The upper front teeth cover the lower ones excessively – in a closed bite, they are additionally tilted backward. More in the article Deep Bite.
• Open bite: Front or side teeth do not meet when biting down.
• Crossbite: Individual upper teeth bite inside past the lower ones – unilaterally or bilaterally. More in the article Treating Crossbite.
• Edge-to-edge bite: The incisal edges meet exactly.

Whether and when a form should be treated depends less on the name than on function and age – in children, the need for treatment is assessed using the KIG classification (section “When Is Orthodontic Treatment Advisable?”).

Causes of Misaligned Teeth

Usually, several factors come together: an inherited predisposition that determines how much space there is in the jaw, and external influences such as habits or early tooth loss that push this predisposition in one direction or another. Only the external influences can be changed, which is why it’s worth taking a closer look at them.

Heredity and Genetic Factors

Many misalignments are hereditary. What is primarily inherited is the size of teeth and jaws, as well as the growth pattern of the face – for example, a relatively short or long lower facial height. Many genes are involved in this, not a single “jaw gene” from either parent. If one parent has an underbite or overbite, an early examination of the child is therefore worthwhile.

Early Tooth Loss or Decay

If baby teeth are lost too early, the natural placeholder for the permanent tooth is missing. Neighboring teeth can tip into the gap — the new tooth then has no room and grows in crooked.

Habits in Childhood

Certain behavioral patterns can influence jaw development, such as:

• Prolonged thumb or pacifier sucking

• Frequent tongue thrusting or mouth breathing

• Incorrect swallowing patterns

A systematic review of 15 studies confirms the connection and shows two things that help parents:⁴ The longer a child sucks, the higher the risk of misalignment. And pacifiers and thumbs have different effects. Thumb sucking is more often associated with protruding upper incisors, while pacifiers are more frequently linked to a lateral crossbite in primary teeth. Mouth breathing and tongue thrusting can also promote an open bite or a narrow upper jaw – more on this in the article Misaligned Teeth and Mouth Breathing.

Missing or Extra Teeth

Anomalies in tooth count — such as too few or too many teeth — can also promote misalignment.

Lack of Space Due to Jaw Size

A jaw that is too small can prevent proper alignment of the teeth. In this case, crowding often occurs.

Consequences of Misaligned Teeth

Misaligned teeth are not just a cosmetic issue. They can also affect the health and function of the entire chewing system.

Possible consequences include:

• Chewing and speech problems

• Increased risk of cavities and gum inflammation due to hard-to-reach areas

• Tension in the temporomandibular joint or neck pain

• Uneven wear of the teeth

• Reduced self-confidence due to appearance

The earlier a misalignment is detected, the easier it is to treat.

How can misaligned teeth be prevented?

Not every misalignment can be prevented — especially when it is genetic. However, there are many ways to reduce the risk and positively influence development.

Early examinations with an orthodontist

Regular examinations from age 6 help detect tooth and jaw development issues early. This allows targeted measures to be initiated in time. During initial examinations in elementary school age, we focus especially on space conditions, bite position, crowding, overjet, and premature loss of primary teeth; crowding is the most common misalignment overall. Not every child needs braces early – but every child should be examined early. Often it is sufficient to simply monitor the development.

Encourage healthy oral habits

• Avoid prolonged sucking

• Promote nasal breathing instead of mouth breathing

• Pay attention to proper swallowing technique

These habits are the levers that parents themselves have control over. They cannot prevent an inherited misalignment, but they can prevent an additional one from developing or worsening.

Care for and preserve primary teeth

Primary teeth are placeholders for permanent teeth. Careful oral hygiene and regular dental visits prevent premature tooth loss.

Balanced diet

Vigorous chewing – for example, of apple pieces, raw vegetables, or whole grain bread – trains the chewing muscles. That softer food alone leads to misalignments is not proven; however, firm chewing is beneficial for teeth and gums in any case.

Early treatment when needed

If initial misalignments appear, early orthodontic therapy can help guide jaw growth in a targeted way.

Not every misalignment needs to be treated early. However, some should not wait until the end of tooth transition – for example, a crossbite, because it can guide the growth of one jaw asymmetrically. An example of this is a case we treated in our practice and that Dr. Julia Steinmaier (née Funke) published with colleagues in the professional journal “Dentista.”

An eight-year-old girl had an anterior crossbite: one upper lateral incisor was biting behind the lower teeth. In addition, she had a narrow upper jaw and rotated upper molars. Treatment was carried out with aligners that were fully planned and fabricated in the practice. The trays were worn 22 hours a day and changed weekly, 16 aligners in the first phase and 6 for refinement. After 22 weeks, the crossbite was corrected. Common alternatives would have been a removable appliance with a spring or a small fixed appliance.

The full publication can be found at Aligner Orthodontics in Children. Treatment with aligners is always a private service; whether statutory health insurance covers early treatment with conventional appliances depends on the KIG classification.

When is orthodontic treatment advisable?

Treatment is advisable when there are functional limitations, discomfort, or visible impairments. The ideal time is usually between ages 9 and 14, when jaw growth is active.

Misaligned teeth can still be successfully corrected in adulthood — thanks to modern methods such as aligners or fixed braces.

For children and adolescents under 18, the KIG classification determines whether statutory health insurance covers the treatment. From KIG 3 onward: Statutory health insurance pays 80 percent of the costs directly; the 20 percent patient share is reimbursed after successful completion of treatment. The patient share can be paid in installments interest-free for up to 18 months directly through the practice. Whether you have statutory or private insurance: Diagnostics, consultation, and care are the same for all our patients.

Detect early, benefit long-term

Misaligned teeth can have many causes, but in most cases can be treated effectively. Those who pay attention to regular check-ups, good oral hygiene, and early prevention can often avoid misalignments or significantly reduce them.

At the first signs of a misalignment, an appointment with an orthodontist is worthwhile — the earlier, the better natural growth can be used.

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