Gummy smile is a condition that promotes a disharmonious smile, altering confidence and decreasing self-esteem of many patients. Luckily, this problem in most cases is easily solved by aesthetic crown lengthening surgery. However, this is a surgery that is still considered by many patients to be painful and uncomfortable. Thereby, this study seeks both to evaluate possible changes in patients' self-esteem and self-confidence after the aesthetic crown lengthening surgery.

Periodontally healthy patients who expressed interest in undergoing ACL will be selected. Before surgery, two questionnaires will be administered: the OHIP-14/Brazil and the Rosenberg Self-Esteem Scale-UNIFESP/EPM. These tools are designed to assess patients' perceptions of self-esteem and quality of life and will be re-administered 30 days and one year after surgery.

Inclusion Criteria:

• Periodontal health diagnosis (full mouth bleeding on probing - BP <10%, clinical attachment level - CAL ≤ 3mm),
• Distance from the gingival margin to the cementum-enamel junction ≥ 3mm associated with a gingival smile and / or short clinical crowns when compared to anatomical crowns, due to the altered passive eruption or gingival overgrowth).
• Good general health

Exclusion Criteria:

• Presence of systemic changes (diabetes, heart disease, hepatitis, etc.)
• Use of medications (such as antibiotics, continuous anti-inflammatory drugs, phenytoin, cyclosporine) that may influence the response to the surgical treatment
• Diagnosis of gingivitis and/or periodontitis
• Smoking habit
• Pregnancy or lactation period

Laser therapy will be performed in a blinded manner for the patients. The crown lengthening surgeon and the outcomes assessor will also be blinded-they will not know which side received the laser therapy. Only the laser operator will have access to this information. The quadrant receiving the therapy will be randomly selected using a computer program by the laser operator.