6 Severe Teeth Problems Clear Aligners May Not Fix
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6 Severe Teeth Problems Clear Aligners May Not Fix

November 27, 2025

If you’ve been meaning to get braces, going with invisible braces can seem like a no-brainer decision.

They are:

  • Less painful
  • Less visible
  • Budget-friendly (find out just how affordable they are in our pricing guide)
  • More time-efficient

There’s just one catch though…

While invisible braces can now solve a host of teeth misalignment problems ranging from mild to complex, there are still some severe conditions that may require other orthodontic treatment options. Unsure if your teeth concerns can be fixed with invisible braces? Here we give you the low-down on the conditions that invisible braces may not be able to fix.

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Read more: Types of malocclusions that Zenyum can help fix

1. Severely rotated teeth

If you have a rotated tooth, it’s likely to be highly visible, especially if it’s one of your incisors, the flat teeth at the front of your mouth. There are several reasons why your teeth are rotated including:

  • Trauma to the tooth during the developmental years
  • Overcrowding
  • Supernumerary (extra) teeth

Research has consistently shown that clear aligners are typically limited in correcting severely rotated teeth. If your rotated tooth is severe (i.e. more than 50 degrees), clear aligners might not be a suitable treatment option for you.

2. Large tooth gaps

Gap teeth, or teeth spacing, refers to when you have large spaces in between your teeth. Gap teeth are usually the result of a discrepancy between your jaw and teeth size–either your jaw is too large and your teeth too small, or a combination of the two.

Nonetheless, there are other causes of teeth spacing as well:

  • Losing a tooth
  • Having been born without a tooth

While clear aligners are perfect for closing small gaps in the teeth, the same can’t be said for large tooth spacings. These large gaps are typically the result of losing a back tooth, missing multiple teeth, or a congenitally missing tooth.

Closing large tooth gaps with clear aligners, without additional orthodontic attention and treatment, can worsen your bite (the way your upper and lower teeth come together) and lead to other severe dental problems!

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Read more: What causes gaps between front teeth?

3. Severely crowded teeth

When you don’t have enough room in your jaw for your teeth to fit properly, your teeth can overlap, bunch up, and twist–sometimes getting pushed to the front of back. The common signs of overcrowding include:

  • Front tooth or teeth sitting high and pointed outwards
  • Overlapped front teeth in the lower jaw

Lack of orthodontic care, and even genetics can all contribute to overcrowding. In comparison to conventional metal braces, invisible braces can’t exert the necessary force needed to create complex tooth movements in order to correct severe overcrowding.

Also, in cases of severe overcrowding, teeth extraction may be necessary to create space in your jaw. Patients having premolar extractions may not be suitable candidates for invisible braces as the aligners cannot always keep the teeth upright during space closure.

In other words, there’s a high level of unpredictability involved during the treatment process.

4. Severe deep overbites

An overbite refers to the vertical overlap between your upper and lower front teeth when you’re biting down. Most people have at least a little overbite, which is approximately 30% to 50% of the height of the lower teeth. Anything over that, however, is considered a deep bite. For severe, deep bites, clear aligners alone won’t be a suitable treatment option.

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Read more: Overbite Explained: Causes, Symptoms, How to Fix It

5. Skeletal malocclusions

This is a developmental deformity which may vary from minor to major malformations of skeletal origin, such as the size, shape, and relative positions of the upper and lower jaws.

With skeletal malocclusions, clear aligners are not the answer. Instead, depending on the patient’s growth status, treatment options commonly include use of the following:

  • Fixed functional appliances (FFAs) to enhance mandibular growth
  • Headgear to restrict maxillary growth
  • Camouflage by extraction of upper and/or lower premolars
  • Surgical correction of the underlying skeletal discrepancy

6. Open bites

If your lower and upper front teeth do not touch each other when you close your mouth, you have an open bite. Because an open bite may be caused by inherited skeletal problems, the same treatment options apply with skeletal malocclusions (i.e. not clear aligners).

The gold-standard treatment typically involves the combined approach of orthodontic treatment with fixed appliances and orthognathic surgery.

‍So, Are Zenyum Invisible Braces Right For You?

After reading about complex dental cases, you might be wondering where your own smile fits in. The great news is that the vast majority of common teeth-alignment issues that people in Singapore want to fix are perfectly suited for clear aligner treatment.

Zenyum Invisible Braces are specifically designed and highly effective for treating the most common mild to moderate concerns, such as:

  • Crowded Teeth: When your teeth are bunched up, overlapped, or slightly crooked.

  • Gaps Between Teeth (Spacing): Closing small, noticeable spaces to create a more uniform smile.

  • Overbites (Protruding Teeth): Correcting upper front teeth that stick out a bit too far.

These are the kinds of smile goals we help thousands of people across Singapore achieve every day. The only way to know for sure if you're a candidate is to have your case professionally reviewed by a licensed dentist. That’s why we created our free online Smile Check- a simple, no-pressure way to get a preliminary look from our dental experts without even leaving your home.

The First Step to Your Smile Solution

Every smile is unique, and choosing the right treatment starts with understanding your needs. For most common issues, like crowding and gaps, Zenyum Invisible Braces offer an effective and affordable solution in Singapore.

Instead of guessing, get a clear professional opinion with no commitment. Your journey to a healthier, more confident smile begins with one simple step.

FAQs

What if I think my case is severe, but I'm not sure?

That’s a very common concern. Many people assume their teeth are more complicated than they actually are. Instead of guessing, you can submit your photos through our free Smile Assessment. Our dental team will review them and give you an honest, preliminary opinion — at no cost.

What happens if a dentist tells me I'm not a suitable candidate for Zenyum?

This is actually a positive and important outcome. Your safety always comes first. If a Zenyum-partnered dentist determines that your case would benefit more from another treatment (such as traditional braces), they’ll explain why and guide you toward the right solution. Clear, professional advice is a key part of the Zenyum process.

What are the most common problems Zenyum can fix?

Zenyum is highly effective for mild to moderate crowding (crooked or overlapping teeth), spacing issues (gaps), and overbites. These are the most frequent cases we handle — and exactly what Zenyum Invisible Braces are designed to improve, helping you achieve a straighter, more confident smile conveniently and affordably.

Start Your Journey Today

How to get started with Zenyum Aligners

Start your Smile Check

Answer a few questions, and take four teeth pictures. It only takes a few minutes!

Book an appointment

Receive a call from us to schedule your dentist appointment

Visit your dentist

You’ll have 3D scans and X-rays taken of your teeth by your dentist

Approve your plan

Give the green light for your Zenyum aligners to go into production after approved by your dentist.