[Research Review] CO₂ Laser as an Alternative to the Scalpel: Lip Repositioning Surgery for the Gummy Smile

Hello and welcome to dentalsolutionusa.com. Today, we are reviewing a very interesting 2025 research paper that explores the use of a CO₂ laser in lip repositioning surgery for treating a gummy smile.

The paper, titled "CO₂ Laser as an Alternative Tool to the Conventional Scalpel in Lip Repositioning Surgery for Gummy Smile," was conducted by Sara Alkari and Omar Hamadah. It investigates whether a 10,600 nm CO₂ laser can safely and effectively replace the conventional scalpel in this esthetic procedure.

1. The Clinical Challenge with Conventional Methods

Lip repositioning surgery is a well-known, conservative treatment designed to reduce excessive gingival display. The procedure involves removing a strip of vestibular mucosa, shortening the vestibular depth, and limiting the upward movement of the upper lip when smiling.

However, traditional scalpel surgery presents several challenges:

• The upper lip tissue is highly vascular, making it prone to significant bleeding.

  
  

• This bleeding reduces surgical visibility and makes suturing much more difficult.

  
  

• It can also lead to increased postoperative discomfort for the patient.

  
  

The researchers wanted to see if the CO₂ laser could overcome these surgical disadvantages.

2. Study Design

To provide strong clinical evidence, the researchers produced two related publications in 2025:

• A Case Series: Three patients were treated exclusively using a CO₂ laser.

  
  

• A Randomized Clinical Trial (RCT): This trial directly compared a CO₂ laser group with a conventional scalpel group, allowing for a robust evaluation of the two techniques.

  
  

3. Key Surgical Findings & Advantages

The clinical findings strongly highlighted the benefits of utilizing the CO₂ laser over the traditional scalpel:

• Effective Gingival Display Reduction: After six months, patients saw an average reduction in gingival display of about 1.9 millimeters. For example, a patient showing 4.6 mm of gingiva before surgery was reduced to approximately 2.7 mm—a clinically visible and esthetically meaningful improvement.

  
  

• Significant Pain Reduction: Patients treated with the CO₂ laser experienced significantly lower postoperative pain and milder discomfort during the healing phase. This is because the laser simultaneously cuts tissue and seals nerve endings and blood vessels, reducing inflammatory trauma.

  
  

• Dramatically Better Bleeding Control: The CO₂ laser created a much cleaner surgical field with minimal bleeding. This provided excellent surgical visibility, easier flap control, and better precision in the highly vascular upper lip tissue.

  
  

• Zero Complications: The laser group reported no infections, no flap dehiscence, no numbness, and no delayed healing. Impressively, patient satisfaction reached 100 percent.

  
  

• Stable Facial Profile: By measuring the nasolabial angle before and after surgery, researchers confirmed that the procedure caused no statistically significant change to the facial profile. The smile improved without negatively affecting facial harmony.

  
  

4. The Biological Advantage of the CO₂ Laser

The success of the CO₂ laser is deeply tied to its biological interaction with human tissue. CO₂ laser energy is strongly absorbed by water. Because soft tissue contains a high percentage of water, the laser allows for:

• Extremely superficial cutting with minimal thermal penetration.

  
  

• Excellent soft tissue control and strong coagulation.

  
  

Unlike lasers that penetrate deeply, the CO₂ laser remains highly surface-controlled, making it exceptionally safe and precise for lip mucosal surgery.

5. Important Limitations to Note

While the results are highly encouraging, the authors noted an important limitation: the potential for long-term relapse. Because the muscle pull of the lip can gradually return, lip repositioning surgery can relapse over time regardless of whether a scalpel or laser is used. This study utilized a six-month follow-up period; future research will require 12 to 24 months of follow-up and larger sample sizes to confirm long-term stability.

6. Clinical Conclusion for Dentists

From a practical perspective, the CO₂ laser does not just replicate scalpel surgery—it fundamentally improves the overall surgical experience. By offering better blood control, reduced pain, improved visibility, and higher patient acceptance, the CO₂ laser is proving to be a highly valuable tool for esthetic soft-tissue procedures.

It performs lip repositioning as effectively as a scalpel while making the procedure much more conservative and comfortable for the patient.

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