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HomeRestorativeOrthodonticsSmile Line & Facial Profile

Smile Line & Facial Profile

Smile Line & Facial Profile
RestorativeDentistry
화살표 아이콘
화살표 아이콘
Restoration
Dentistry
  • 01

    Tooth Reshaping

    Tooth Reshaping

  • 02

    Alveolar Bone & Arch Correction

    Alveolar Bone & Arch Correction

  • 03

    Reconstructive Implant Dentistry

    Reconstructive Implant Dentistry

The Square Dental Clinic was founded by dentists trained at Seoul National University and has remained in the same location in Gwanghwamun and Jongno for nearly a decade. Guided by the principle, “We never provide treatment that we would not recommend to our own family,” we have approached every case with meticulous care and craftsmanship. Thanks to the trust of our patients, The Square Dental Clinic has grown into a clinic known by word of mouth throughout Gwanghwamun and Jongno for both its clinical care and overall environment.

For comprehensive smile restoration and facial reconstruction, our team brings together specialists in integrated dentistry, prosthodontics, and orthodontics trained at Seoul National University. By combining expertise across multiple disciplines, we provide coordinated treatment designed to achieve a high level of precision, function, and aesthetics.

The Square Total Solution begins with a comprehensive diagnosis and an individualized treatment plan. Rather than relying on a single type of treatment, we combine the appropriate disciplines to pursue a balanced result that considers both function and aesthetics. In complex cases, limiting treatment to only one area can lead to an incomplete plan and compromise the final outcome.

Smile Line Recovery

Smile Arc

Smile Arc

The smile arc refers to the curve created by the incisal edges of the upper teeth. A natural and aesthetically pleasing smile arc generally follows the curvature of the lower lip, with the upper front teeth forming a gentle upward curve.

Vertical Position of the Smile Arc

An aesthetically balanced smile typically displays most of the upper teeth, with the gingival margin of the upper teeth positioned near the upper lip and the upper front teeth overlapping the lower front teeth by approximately 1–2 mm. The ends of the smile arc generally sit slightly below the corners of the mouth.

Vertical Position of the Smile Arc
Shape of the Smile Arc

Shape of the Smile Arc

A smile arc that follows the natural curvature of the lower lip generally creates a softer and more harmonious smile.

Buccal Corridor

Buccal Corridor

01

Buccal Corridor

The buccal corridor is the dark space visible between the side teeth and the corners of the mouth when smiling. Its appearance is influenced by the relationship between the lips and the shape and width of the dental arch.

02

An Ideal Buccal Corridor

An Ideal Buccal Corridor

An ideal buccal corridor generally allows the area up to the front portion of the first molars to be naturally visible.

An Excessively Narrow Buccal Corridor

Too many teeth may be visible, creating an overly full or crowded appearance.

An Excessively Wide Buccal Corridor

Too little of the teeth may be visible, making the smile appear narrow or constricted.

Buccal Corridor

Facial Muscles

Facial Muscles

01

Muscles Involved in Smiling

Upper Face

Muscles around the eyes

Midface

Zygomaticus major and zygomaticus minor muscles

Lower Face

Muscles around the lips, particularly the modiolus—the point where several facial muscles converge—can have a significant influence on the natural appearance of a smile.

02

Facial Exercises

Lift the corners of your mouth while showing as many teeth as comfortably possible. Hold for 3 seconds and repeat 10 times.

Place your fingers at the corners of your mouth to create gentle resistance, then lift the corners upward. Hold for 3 seconds and repeat 10 times.

Fill your cheeks with air like a pufferfish, hold for 3 seconds, and repeat 10 times.

Purse your lips forward as if making an “O” shape, hold for 3 seconds, and repeat 10 times.

Facial Exercises

Golden Proportions

Golden Proportions

01

Bolton Ratio

The Bolton ratio evaluates the relative sizes of the upper and lower teeth to help achieve harmonious proportions between the two arches.

02

RED Proportion

The RED proportion evaluates the apparent width of the front teeth when viewed from the front. A repeated proportion of approximately 62% has traditionally been discussed as a reference for dental aesthetics.

However, ideal proportions are not identical for every patient. Facial shape, dental arch width, tooth morphology, and individual ethnic characteristics should all be considered when designing a natural smile.

RED Proportion

Dental Midline

A noticeable discrepancy in the dental midline can contribute to an asymmetric appearance. When the tooth-size relationship is appropriate, orthodontic treatment or restorative treatment may be used to improve the midline.
It is important not to evaluate only the relationship between the upper and lower dental midlines. The dental midline should also be assessed in relation to the facial midline to create a more balanced overall appearance.

Case | Midline Correction with MINISH

Case: Midline Correction with MINISH

Case | Midline Correction with Orthodontic Treatment

Case: Midline Correction with Orthodontic Treatment

Facial Profile Reconstruction

Facial Profile Reconstruction

Facial Profile Improvement

Facial Profile Classification

Severe skeletal malocclusion may require surgical treatment such as orthognathic surgery.

Approaches to Improving the Side Profile

In cases of severe skeletal malocclusion, surgical treatment such as orthognathic surgery may need to be considered.

Improving Tooth Angulation

Improving Tooth Angulation

Improving the Shape and Position of Protruding Teeth

Improving the Shape and Position of Protruding Teeth

Improving Lip Support and Protrusion

Improving Lip Support and Protrusion

E-Line Assessment

Severe skeletal malocclusion may require surgical treatment such as orthognathic surgery.

Improving Facial Asymmetry

To evaluate horizontal dental asymmetry, we compare the interpupillary line—the line connecting the pupils—with the occlusal plane. A discrepancy between these two reference lines can contribute to a canted or asymmetric appearance.

True skeletal asymmetry generally cannot be fully corrected with orthodontics alone. Dental asymmetry, however, may be improved orthodontically, while certain muscular asymmetries may require additional treatment depending on the cause.

Severe skeletal malocclusion may require surgical treatment such as orthognathic surgery.

Improving Facial Asymmetry

Approaches to Improving the Frontal Profile

Improving Asymmetry with Orthodontic Treatment

Improving Asymmetry with Orthodontic Treatment

Improving Asymmetry with Restorative Tooth Reshaping

Improving Asymmetry with Restorative Tooth Reshaping

Improving Facial Proportions

Aesthetic Differences According to Lower Facial Height

Severe skeletal malocclusion may require surgical treatment such as orthognathic surgery.

Improving Facial Proportions

Treatment Options for Improving Lower Facial Proportions

Improving Lower Facial Proportions with Orthodontic Treatment

Improving Lower Facial Proportions with Reconstructive Implant Treatment

Improving Lower Facial Proportions with Full-Mouth Restorative Treatment

Improving Lower Facial Proportions with Orthodontic Treatment

Improving Lower Facial Proportions with Full-Mouth Restorative Treatment

Improving Lower Facial Proportions with Full-Mouth Restorative Treatment

Specialist Column