Abstract: Objective: To study the sensitivity and acceptability of different groups for the asymmetry of central incisors gingival margin, to explore the views of different people on the aesthetics of soft tissue, and to guide the clinicians for better repair of anterior teeth. Methods: This experiment is randomized and controlled trial. Participants (913) were divided into A, B, C three groups. Gingival margin pictures with different degrees of asymmetry were disordered and subjected for VAS score and acceptance by three groups, which was used to learn the sensitivity and acceptance. Results: The minimal detection rates of dental professionals were ±0.75mm (P<0.05), and those of laypersons were +1.00mm and -1.50mm (P<0.05). Dental professionals’ 50% acceptance values were ±1.00mm and those of laypersons were +1.50mm and -1.25mm. Conclusion: Professionals are easier to detect gingival changes than laypersons, and they have small range of acceptance.

Key words: Aesthetic restoration, Aesthetics of soft tissue, Minimum perceived value, Acceptable degree