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Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months

Yonsei Baro Dental Clinic · 치과미슐랭 · June 1, 2026

Hello. This is Yonsei Baro Dental Clinic, an orthodontic clinic in Apgujeong. Today, we would like to introduce a case of eliminating black triangles during orthodontic re-treatmen...

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This page is an English translation of a Korean Naver Blog archive entry. For exact wording and source context, verify against the Korean archive original and the original Naver post.

Clinic: Yonsei Baro Dental Clinic

Original post date: June 1, 2026

Translated at: August 17, 2026 at 4:25 PM

Medical note: This translation does not guarantee medical accuracy or suitability for treatment decisions.

Hello.

This is Yonsei Baro Dental Clinic, an orthodontic clinic in Apgujeong.

Today, we would like to introduce a case of eliminating black triangles during orthodontic re-treatment.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 1

23.04–23.08

Today, we will show you a case involving the elimination of black triangles during orthodontic re-treatment, treated with a 2D appliance that is not visible from the front.

This patient visited us for re-treatment after their front teeth became misaligned again when they had the fixed wire retainer, which they had been wearing since orthodontic treatment long ago, removed because it was uncomfortable.

Q. Can teeth become misaligned again if retainers are removed after orthodontic treatment?

More people than you might think remove their retainers after completing orthodontic treatment and continue with their daily lives.

However, because teeth naturally tend to return to their original positions, insufficient retention care can cause them to become crooked again or cause the black triangles between the front teeth to grow larger.

The patient introduced today also chose orthodontic re-treatment after their front teeth became misaligned again and the black triangles grew larger when they removed their retainer following orthodontic treatment in the past.

We will show you an actual case in which the alignment and black triangles were improved in just 4 months using a 2D lingual orthodontic appliance that is not visible from the front.

We hope this will be helpful to those considering orthodontic re-treatment and those wondering why they need to continue wearing their retainers.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 2

23.04

If you remove a fixed wire retainer several years after orthodontic treatment, the teeth will become misaligned again 100% of the time.

However, this can vary depending on the condition of the gums.

Some people’s teeth become misaligned again quickly,

while others experience little misalignment even after several years.

Viewed from the front, the black triangles were particularly large.

In particular, the two front teeth appeared unusually large.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 3

23.04

Teeth are strongly affected by perspective.

When patients say that their two front teeth seem too large, it is often not because of the size of the teeth themselves, but because the two front teeth are positioned farther forward than the adjacent teeth.

Even correcting the alignment can naturally resolve the appearance of oversized front teeth.

Because this was orthodontic re-treatment, the patient chose the invisible 2D appliance.

Treatment was carried out with interproximal reduction and elastics.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 4

23.06

This is how things looked 2 months after treatment began.

The 2D appliance is attached to the back surfaces of the teeth on the lingual side, so it is not noticeable from the front during orthodontic treatment.

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23.06

The black triangles had already decreased considerably.

The blue arrow in the photo points to an appliance that prevents spaces from opening behind the canine.

Partial orthodontic treatment for the front teeth may look simple,

but it is actually a treatment that requires considerable attention to prevent side effects such as spaces opening behind the canines.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 6

23.08

After that, we continued with an additional 2 months of finishing treatment and completed the orthodontic re-treatment.

The total treatment period was 4 months.

Some patients occasionally ask whether a short orthodontic treatment period can place strain on the gums.

Teeth do not move faster simply because a strong force is applied.

Rather, excessive force can slow tooth movement and place strain on the gums.

For orthodontic treatment to finish quickly, it is necessary to predict all tooth-movement patterns in advance from the beginning and provide treatment that prevents delays.

Ultimately, this requires considerable experience and expertise from the orthodontist providing the treatment.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 7

23.04–23.08

The black triangles were also significantly reduced when viewed from an angled side perspective.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 8

23.04–23.08

By combining interproximal reduction with elastics, we moved the protruding front teeth considerably backward.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 9

23.04–23.08

The fixed wire retainer also fit neatly without causing any foreign-body sensation.

Retainers also require regular maintenance.

This time, the patient decided to receive thorough regular checkups and retention care.

Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 10

23.04–23.08

The issue of the two front teeth appearing unusually large was also resolved neatly.

It feels good to see the patient’s appearance looking cleaner.

Although extensive, high-difficulty orthodontic treatment that takes 1–2 years has its own value, partial orthodontic treatment for the front teeth that produces good results in a short period is also highly rewarding.

Rather than continuing to worry about black triangles that developed after orthodontic treatment long ago or teeth that have become misaligned again,

visit a nearby orthodontic clinic for a consultation.

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Be Sure to Read This If You Are Considering Re-treatment! How Your Front Teeth Changed in Just 4 Months image 12

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